Question

The area of a regular octagon is 50 cm2. What is the area of a regular octagon with sides three times as large?

Answer 1

A.450 cm2
B. 515 cm2
C.7500 cm2
D.150 cm2

Answer 2

First you need to know how the area is calculated:\[\large A_{octagon}=( 2 + 2√2 )s^2\]You're given the original area so you can solve for s. Then recalculate it with an s that's 3 times larger.