The slant height of this cone is the length of the sides of the cone taken from vertex to the outer line of the circular base. It is denoted by ‘l’. The altitude of a right cone is the perpendicular line from the vertex to the centre of the base. It coincides with the axis of the cone and is represented by ‘h’. ✅To learn more about Mensuration, enroll in our full course now: infinitylearn.com/cbse-fullcourse?RU-vid&DME&D2eekM To watch more videos related to Geometry, click here: bit.ly/MiddleSchoolGeometryPart2
0:56 Shouldn't the points in the sector be A, O, and A, since the circle wraps around back to the same point? Wouldn't the sector A, O, B only be half of the lateral area of a cone
This helps me a lot. Thank you. I was restudying and the text book just summarized this whole thing in 4 lines. Jeez I spent 1 hours staring at those four lines before being saved by your video
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Thank you, very helpful explain of a cone. I needed the Theta simbol to solve and finally got what i wanted to get the shape of the surfaces. Thankful to you :)
Note that if you measure in _radians_ instead of degrees, theta = (arc length / arc radius) = (2*pi * r) / l, making it simpler to form the equation for lateral surface area and arrive at the answer. E.g: lateral surface area = 2pi * l^2 * (theta / full circle) = 2pi * l^2 * (2*pi*r/l radians) / (2*pi radians) = 2pi * l^2 * r/l = 2pi * l * r
@Reena - The Greek letter, θ, commonly used to represent an angular measurement/variable. Because trying to type letters outside your native keyboard is super annoying.
I just so confused about the curved surface area in another videos, but this video helped me a lot to understand it, thank u so much, rlly appreciate all of your efforts for this video.
+Ritesh - NEVER UNIFORM, thank you for your question. These two videos will help you understand why: Length of an Arc - ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-v-ZV_jMumFE.html Area of the Sector - ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-7f9_U85_YX4.html
look at it as a fraction of the whole circle, imagine the angle theta is 90 degrees so it would become one quarter of the circle, or 180 degrees so it become 1/2 of the circle then calculate it. 90/360 or 180/360 or 30/360.
You're most welcome Garry. We are glad that you understood the concept. We are happy that we could help you learn. Do support us by subscribing to our channel. 👍👍
It's my pleasure. We are glad that you understood the concept. We are happy that we could help you learn. For more videos, please visit our website - dontmemorise.com/
AB are labeled such that the line segment AB forms a diameter across the base. Yet, arc AB forms a... full circle? ABA or BAB, maybe. But AB is only half a circle.
The label on the video is incorrect. Arc AB is half the circumference if AB is a diameter. What you meant to say is that the sector goes from point A around the circumference back to point A, An animation showing the unwrapping of the cone would show that.
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