Regular octagon pad

You need to make a pad in the shape of a regular octagon with a side length of 4 cm. What is the minimum diameter of the circle-shaped semi-finished product from which we make the pad, and what will be the percentage of waste? (Round the results to 1 decimal place)

Correct answer:

D =  10.5 cm
p =  10 %

Step-by-step explanation:

S1=π r2=3.1416 5.2263285.8085 cm2 S0=2a h=24 4.82849.6569 cm2  S2=n S0=8 9.656977.2548 cm2  p=100 S1S1S2=100 85.808585.808577.2548=10%

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