Question

The area of a regular octagon is 35 cm2. What is the area of a regular octagon with sides five times as long?
A. 625 cm2
B. 875 cm2
C. 175 cm2
D. 245 cm2

Answer 1

multiply by the original area by 5^2 =25

Answer 2

875

Answer 3

yup

Answer 4

thanks

Answer 5

welcome

Answer 6

if 35 is the area we want to work out first what each side is

because an octogan has eight sides we divide this by 8

35/8 = 4.375 is the length of the sides

now it says that the length of the sides is 5 times as long
so we multiply this side by 5 to make it 5 times as long

4.375 * 5 = 21.875

now we need to work out the area so we multiply it by 8 because an octogan has 8 sides

21.875 * 8 = 175 cm2