Question

What is the area of a regular octagon with a side of 8 in.? Round the answer to the nearest tenth?
a. 443.4 in.
b. 618.0 in.
c. 221.7 in.
d. 309.0 in.

Answer 1

@Jacob can you help?

Answer 2

if you complete it would be a square
so the are would be a square area - 4* triangles area

Answer 3

* so the area would be square area - 4 triangles area

Answer 4

8=x sqrt(2)
x=4sqrt(2)

Answer 5

triangle area= 1/2*b*h=1/2*(4*sqrt(2))*(4sqrt(2))=16

Answer 6

square area= L*L= (4*sqrt(2)+8+4sqrt(2))^2

Answer 7

=(8*sqrt(2)+8)^2-4*16=309

Answer 8

D

Answer 9

Thank you!