Cutting square

We cut the circle with the highest possible diameter from a square with a side of 30 cm. How many percents of the square area is this circle?

Correct answer:

p =  78.5398 %

Step-by-step explanation:

a=30 cm r=a/2=30/2=15 cm S1=a2=302=900 cm2 S2=π r2=3.1416 152706.8583 cm2  p=100 S1S2=100 900706.8583=78.5398%

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