Question

The formula for s is The perimeter of a regular octagon is p and the length of a side is s. s = p ÷ 8 Find the length of a side when the perimeter is 72 cm. cm Write down a formula for p in terms of s. p = Write down a formula for the perimeter of this regular shape. p = Find p when s is 9 cm. cm

Answer 1

s = 9 cm

p = 8s

p = 72 cm

Explanation:

s = p ÷ 8

Where,

s = length of a side

p = perimeter of a regular octagon

find s when p = 72 cm

s = p ÷ 8

= 72 cm ÷ 8

= 9 cm

s = 9 cm

Formula for p in terms of a

s = p ÷ 8

Equivalent to

s = p/8

Cross product

s * 8 = p

p = 8s

Find p when s = 9 cm

p = 8s

p = 8 * 9 cm

= 72 cm

p = 72 cm