How to find height and understand the formula for area of an oblique triangle

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👉 Learn how to find the area of a triangle. The area of a triangle is the measure of the region enclosed by the triangle. There are several methods that can be used to find the area of a triangle depending on the available information.
When the length of the base of a triangle and the perpendicular height to the base of the triangle are known, then the area of the triangle is given by half the length of the base times the height.
When the lengths of two sides of a triangle and the angle in-between the two known lengths are known, then the area of the triangle is given by half the product of the two known side lengths times the sine of the angle in-between the two known side lengths.
When the three sides of the triangle are known, a method of finding the area of a triangle known as Heron's formula is employed. Heron's formula is given by the square root of the product of half the sum of the side lengths and the difference between half the sum of the side lengths and the side lengths.
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Organized Videos:
✅ Law of Sines
• Law of Sines
✅ Determine 1, 2 or No Triangle
• Determine 1, 2 or No T...
✅ Law of Sines | Learn About
• Law of Sines | Learn A...
✅ Law of Sines | ASA
• Law of Sines | ASA
✅ Law of Sines | AAS
• Law of Sines | AAS
✅ Law of Sines Ambiguous Case 2 Triangles
• Law of Sines Ambiguous...
✅ Law of Sines Ambiguous Case 1 Triangle
• Law of Sines Ambiguous...
✅ Law of Sines Ambiguous Case No Triangle
• Law of Sines Ambiguous...
✅ Ambiguous Case Law of Sines | Learn About
• Ambiguous Case Law of ...
✅ Find the Area of an Oblique Triangle SAS
• Find the Area of an Ob...
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Опубликовано:

19 фев 2013

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Комментарии : 205

@Paintheshed 4 года назад

erm, this is why I hate maths, because it jumps from easy to the deep ocean in 3 minutes...

@ChocolateLover1938 4 года назад

Exactly

@doroncf5686 3 года назад

it jumped from easy to deep ocean for you because you didnt understand a part prob, if you learn everything in order math is easy

@Paintheshed 3 года назад

@@doroncf5686 yes I am always missing big chunks and concepts so I lose the thread

@ulikejazzwiman 3 года назад

true lmao

@sulaimaatif2402 3 года назад

Ikr lol

@brianmclogan 11 лет назад

NOOO! where did I lose you?

@lunziforever5956 3 года назад

???lose what

@thomasmiller5701 3 года назад

U lost me when u started doing the formula, got it now though

@premsalunkhe8526 3 года назад

@@lunziforever5956 He commented a year later of uploading which means forgot that he has uploaded this video or he couldn't find this video

@renelammers813 3 года назад

@@premsalunkhe8526 no, i think he posted this comment before replying was a thing so he was replying to someone

@RetroDreamer 2 года назад

Guys, I think he means that we are scrolling through comments instead of doing our work or listening to his explanation XD. Especially because this isn't pinned so we would have had to scroll to see this. haha XD

@sergeantrainstorm1269 4 года назад

My left ear enjoyed that very much. Thank you!

@ejanocrowsnatcher6785 10 лет назад

"Lets pretend to make this a right angle triangle. Right?" lel

@brianmclogan 10 лет назад

ejano Crowsnatcher yes

@RetroDreamer 2 года назад

Let's all admit it guys, this dude is awesome! XD Been coming here whenever I have had trouble with my work for 2 or 3 years now. And even if I was just missing something/ misread I always realize it watching these videos. XD Thanks for always making awesome videos!

@jumanjung790 5 лет назад

Thanks helped a lot with what I'm studying rn

@brianmclogan 10 лет назад

Yes this is mostly 10th and 11th grades math. However I always have to remind the students of older material taught

@daurianne2216 6 лет назад

Omg... I do this in my 6th grade math! why

@LightSketch 6 лет назад

same

@haileycarr9257 5 лет назад

daurianne same lol

@akam9919 5 лет назад

@@daurianne2216 when your teach forgets what your grade is.

@willclark1811 4 года назад

Brian McLogan wha? I’m lookin at this for 6th

@nusrattanweer4121 3 года назад

Thanks a lot sir. I wish I had a teacher like you for teaching me maths whenever I come back from my classes I always see the video of what you have uploaded. Thanks a lot sir.

@sienuhhh1794 3 года назад

me sobbing watching this bc im so bad at math 👁💧👄💧👁

@shirleyqueenn 3 года назад

i cant see through my tears

@mina1uvsu 4 года назад

Thank you for the help! 🙏 😊 You are like an AMAZING math teacher! I wish you were my teacher -_- 😂😂 Thank you again for all your help! Your videos are awesome and I wish you good luck for your future and your channel! ❤️💫👍

@xavierntamere7078 4 года назад

I appreciate the help. first couple minutes was all i needed to finish my hw and studying

@ezioauditore7636 5 лет назад

One question, why do we multiply the other height by the base on the other one??

@marisolbarreto9964 3 года назад

Ok so I have geometry and there is this question where the height is 5m but there is no base? What do I do?

@geniusta9661 5 лет назад

you could just use herons for the area.. i came to find the altitude of a right triangle when given the side lengths

@tangerineluvr 8 лет назад

You're seriously amazing. I wish I had you as my math teacher! I always end up coming home, watching your videos and understanding it haha.

@brianmclogan 8 лет назад

+Julia Ha just happy to be able to make a difference for you, keep up the hard work and let me know how i can assist you!

@azaheltes4741 2 года назад

Now ur like my favorite math youtuber i love ur vid!

@user-jq4fn5tf2i 3 года назад

how do we solve that when given sides are not a,b,c, just another letters?

@sillycybin420 8 лет назад

Thank you really needed before finals!

@brianmclogan 8 лет назад

+Santiago Patino you are welcome! hope you did well

@trash_atlife2439 4 года назад

I'm here just tryna find out how high do my mincraft field need to be in order for the water to push it down.😅 (Corona virus)

@kotarojujo6365 4 года назад

What

@Redditard 4 года назад

@@kotarojujo6365 the

@kotarojujo6365 4 года назад

Bilakshan Purohit wa

@Redditard 4 года назад

@@kotarojujo6365 edit your reply and write "hell"

@jakeybabuy19 3 года назад

@@Redditard lemme do it for you *Hell*

@sarahsamuelson5477 2 года назад

Genius! Thank you so much.

@wahidjarif4873 5 лет назад

You help a lot to me THANKS

@sporadic001 7 лет назад

could you please help me? How do I find the INTERIOR height of an obtuse triangle? I'm not given any angles, I just know the biggest side is 20, and the smallest 9, and when you add those two dotted lines at the side to make the triangle a "right" triangle, that height is 12.

@brianmclogan 7 лет назад

sorry I am only able to focus on the problems for my classes

@Prucix 5 лет назад

Hey Brian mclogan, I’m in 7th grade and I don’t understand what you mean by H=BsinA. I know that means height=B something A. Thanks BTW I am a huge fan of your channel I use it every day if I need help with math, Keep up the good work! You look like a good math teacher, wish I had you .

@tanmaydabhade9345 5 лет назад

Thank for the help

@hweartened2606 3 года назад

thank you this really helps ☺️

@galacticrelic258 9 лет назад

Keep this up man! Great work. I wish you were my teacher.

@brianmclogan 9 лет назад

RIP In Peace Seamus just trying to do my part to improve math education

@AzraIcli 4 года назад

Not hating but like imagine going to a cool meeting and wearing a shirt that says math videos on it XD

@cokemanjake6284 Год назад

The Harlem shake comment at 1:45 took me back lol

@jeremyabenojar7085 8 лет назад

Thanks for the great lesson sir

@brianmclogan 8 лет назад

+Jeremy Abenojar you are very welcome! happy to be able to help!

@stiyg 8 лет назад

Hey i have a question um what mode do i put my calculator in?

@brianmclogan 8 лет назад

+Stiyg depends on what type of angles you are working with, if degrees use degrees, if radians use radians

@nadersherif5712 4 года назад

Use Sin()

@morten4205 10 лет назад

Harlem shake hehe. thx for the help btw

@morten4205 9 лет назад

freddo 1614 Dunno man, I commented a year ago. No way I could remember why I commented that..

@jonathanduong881 9 лет назад

Lol

@jimmyjames7941 7 лет назад

Morten because a guy in the background said it i was going to comment that

@morten4205 7 лет назад

At last, after years of waiting i've solved the mystery. xD

@barakapeterb2592 5 лет назад

Your movie is good to me i Love you

@Alex-qd7hl 4 года назад

This helped me fo my 4th grading at 4th grade

@PalasBrown 5 месяцев назад

thanks, you have been educated me

@fatimazahran7171 4 года назад

Thanks so much

@HealingCreationsPNW 11 месяцев назад

Helping me again, thank you!!

@brianmclogan 11 месяцев назад

Happy to help!

@prisilahernandez9620 8 лет назад

I'm trying to get my ged, and took the pre test. that I have to pass to do the actual ged test, last night. I had a question similar to this ... and I got stuck ... helped a little. I'm sure I'll remember next time

@brianmclogan 8 лет назад

+Prisila keep working hard, happy my videos can help you out

@prisilahernandez9620 8 лет назад

+Mr. McLogan's Math Channel thank you and of course. any help taken is progress

@bullrancher6508 4 года назад

R u teaching a lesson and recording? Genius

@mina1uvsu 4 года назад

Reaper Ristov Yeahhh ikr

@danialbrown4417 4 года назад

I just proved law of sin(A)/a = sin(B)/b. This was one of my channels on my way to this point. Super nice

@catherinedimartino9169 4 года назад

love this video

@sourlimeade1398 4 года назад

This is what I have to learn. I'm in 5th grade. Note: The school I go to is very school-forward and academically driven.

@helenliu2438 4 года назад

Meh too 6th grade

@RetroDreamer 2 года назад

Ahhh I don't think I learned this until 6th grade. I came here because I thought I was missing something, but turns out the numbers on my pages didn't print out nicely because they were in yellow. XD But ahhh 5th grade???

@MrFunnylicious 10 лет назад

lol what year/grade is this? learning how to find the area of a triangle and trigonometry at the same time? I live in Australia, we learn areas in about year 7 or 8 and learn trigonometry (sine, cosine, tangent, etc.) in year 11.

@askmsk30 4 года назад

MrFunnylicious 11th grade

@lunziforever5956 3 года назад

Explained what my teacher couldn't in couple mins thnx

@triple7marc 8 лет назад

Can you please help me? I need to find the height of a triangle. It is a scalene triangle. How would I do this? I don't need to find the area; just the height.

@brianmclogan 8 лет назад

+Marc Weiner I do not know what information you are given, or what chapter your question is in. There are many different ways based on this information. Most likely you will need to draw a line that represents the height(perpendicular bisector) and use trigonometric ratios (sine,cosine,tangent) to identify the missing side of the right triangle created

@triple7marc 8 лет назад

Mr. McLogan's Math Channel Yes I understand now. I asked my math teacher and she said to use trigonometry. I didn't even think about using it. Thanks!

@sarahlouiseamissahyamson8520 3 года назад

Thank you sooooooooooooooooooo much !!!!!!!!!!!!!

@sarahlouiseamissahyamson8520 3 года назад

Scratch that you lost me .

@eatinsomtin9984 3 года назад

you're a godsend

@planckstech292 Год назад

Very good explanation sir 👌 ❤️ ❤️

@vickiakascottswife1929 6 лет назад

Thanks for the videos! I'm learning more here than from my own math teacher! He SUCKS and should be teaching!!! For that I have to suffer!

@brianmclogan 6 лет назад

sorry to hear about that, but happy to be here for you!

@mistersly5652 Год назад

I have this triangle, given the lengths Base is 60, 45 & 30 but it doesn't have height nor any degree and I can't figure how to get the height. 🤔🤷

@adibayoutube3897 5 лет назад

Thanks you help me with my 5 th grade hw

@shaanpatel3413 4 года назад

Thanks

@kamranmohammad8376 3 года назад

study pug ads: do the videos from 2000 really help u? me: this guy's video helped me then u ever could

@ironic17 3 года назад

Nerd.

@Ddoesitbetter 5 лет назад

I do independent studies and your channel helps me a shit ton, thanks my dude!

@AsmaKhan-sp3gs 8 лет назад

mare madad karna ka laya shukria

@brianmclogan 8 лет назад

+Asma Khan thank you

@tgfxpl4t1num21 9 лет назад

I'm learning this in grade 9 academic math

@brianmclogan 9 лет назад

TGF x awesome! keep it up

@vince3625 5 лет назад

I’m learning this In 7th grade

@rehanarai587 7 лет назад

can u help me I am 10 years old for right angle x and 27 degrees today is my test in Guyana plz

@brianmclogan 7 лет назад

best of luck! unfortunately I do not have enough information on your problem to offer any advice, most likely will need to use your trigonometric ratios

@jordanbrown8317 6 лет назад

You are the man

@brianmclogan 6 лет назад

just happy to be able to help

@junaidratul4786 5 лет назад

What if i dont know the area?

@Prucix 5 лет назад

If you don’t know the area, solve for it by doing 1/2 of A times B.

@Prucix 5 лет назад

The area for height is H=BsinA Btw what does sin mean?

@Prucix 5 лет назад

I mean formula

@rememberme3156 4 года назад

saved me from getting my homework wrong. thx 4 the help

@KittenPinkamations 5 лет назад

This saved my arse

@melimelon6080 5 лет назад

im a yr7?????????????

@barakapeterb2592 5 лет назад

You are nice and I Love you

@barakapeterb2592 5 лет назад

i Love you and you make me happy

@guadalupeg3598 5 лет назад

@@barakapeterb2592*???*

@amila9419 3 года назад

@@barakapeterb2592 wht

@donmota3360 5 лет назад

What level of algebra is this or geometry

@akam9919 5 лет назад

i know we studied this during trig. It might be geo or algebra 2. I'm leaning toward geo though.

@xavierntamere7078 4 года назад

It literally says #trigonometry right beneath the video

@shobhitasthana6425 5 лет назад

Can we use Pythagoras theory

@brianmclogan 5 лет назад

only for right triangles

@shobhitasthana6425 5 лет назад

Thanks I am from India 🇮🇳

@brianmclogan 5 лет назад

awesome! you are very welcome Shobhit!

@Rampartz 3 года назад

@arcandi5560 3 года назад

i got confised in the "sin" part

@lolaispretty 3 года назад

It sucks how 9th graders were learning this stuff in 9th grade and I’m learning this in 6th. I’m struggling with math right now and I have a test in less than a week. I’m scared I’m going to do bad 😕

@hamsakev4224 3 года назад

Bro im in 6th grade and learning this. This is soo hard

@lolaispretty 3 года назад

@@hamsakev4224 Wish you the best of luck, you’ll be needing it

@hamsakev4224 3 года назад

Haha thanks. So far not so good-

@lolaispretty 3 года назад

@@hamsakev4224 We were doing easy stuff for a couple weeks then it just changed to trial and error 😥 helpp me 😭

@mythic_legend7058 3 года назад

Same

@ravidatt4592 Год назад

Randy Orton taking maths lecture 🦧

@11SEXMACHINE 8 лет назад

what if you only knew b and wanted to find the height

@brianmclogan 8 лет назад

+Dana Steele just use the formula, area=(1/2)base*heighet

@anthonymartineziii 4 года назад

S C asked how to find height. I'm seeking the same answer, and your reply wasn't at all helpful. (How can we multiply base times height if we still don't know what the HEIGHT is?)