Question

a jigsaw puzzle is in the shape of a regular pentagon. Find its area if its radius is 17 centimeters and its side length is 20 centimeters

Answer 1

let's try splitting it into five triangles like so, then finding the area of the bottom triangle

we can draw another radius line to make the height of the triangle a bit more clear

Answer 2

anyway, you'd use the pythagorean theorem to find the height of the triangle, and ~then~ do

area of triangle = (1/2)(b)(h) and then multiply the area by 5