Triangulation 

I wish you were my math teacher, or just my teacher overall.

@tolli111 Yeah, there pretty massive! I live in the Pacific Northwest, so the tallest trees are mostly the douglas fir and the white fir. The white fir is the tallest, as I said about 120-160 feet, but the douglas fir is much thicker in diameter. As said, I have to measure it, but I've compared a length of ground that I know to be 100 feet exactly and compared that to the trees, and there obviously about 1.5 times higher. The highest ones are still only about 4 feet in diameter though.

@pagani8 damn! I saw some sequoia's in Yosemite when I went there on vacation...huuuuuge, love nature!

@pagani8 you have trees of 50 meters????

I love your Videos they are so well explained not to mention that English is not my native language

Thanks so much! I've always wondered exactly how tall the trees in my yard are, as they're very tall, (Until I do what you did it this video, I'm guessing about 150 feet) it'd be very cool to know!