Question

Geometry problem #2
*Old rule: no calculator!*

Answer 1

Area of the polygon-12 * area of the 1 cm side equilateral triangle.

Am I missing something?

Answer 2

I think that's it :)

Answer 3

You could find the area of the entire polygon by breaking it into triangles and multiplying the area of that triangle by 12:

If you divide that triangle in half, it becomes a right triangle so you can use the magic of trigonometric functions to find the height.


Once you have the height, you can just find the area of the triangle using "A=1/2 bh", and then multiply by 12 to get area of the regular 12-sided polygon.