Question

Find the area of a regular decagon with a 12.3 in, apothem and 8 in. sides.

A. 49.2 in.

B. 128 in

C. 492 in

D. 942 in.

Answer 1

C

Explanation:

The area (A) of a regular decagon is

A =
`(1)/(2)` perimeter × apothem

perimeter = 10 × 8 = 80 in, thus

A = 0.5 × 80 × 12.3 = 492 in² → D