Depends on where you are in the math book but this would be the most simple way.
n= number
sqar(-1) = i
……….Yes it is true that trapezoid is a polygon that has two bases
4 * 10 = 40
5 * 10 = 50
6 * 10 = 60
The side length of the original large triangle are 40 feet, 50 feet, and 60 feet.
8 ..................................