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Answer:
s = 9 cm
p = 8s
p = 72 cm
Step-by-step 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