Question

There is and old way to derive area of a circle when circumference s = 2*pi*r and r is radius of the circle. The method consists of putting strings inside the circle and then laying them straight forming a triangle. Derive circle area formula using this technique.

I'm having hard time with this :/

Answer 1

well, thats it

Answer 2

think of peeling an onion helps me

Answer 3

each layer of circumference that you peel away stacks up; and once you get to the height of the radius your done

Answer 4

the base circumference is just 2pi r

and the height is still r

Area of a tria is base * height /2

Answer 5

visualization helped a bit, im just bad at concepting things like this in my mind..

Answer 6

:) good luck with it all

Answer 7

thanks