Percentage of waste

In a square plate with a side 75 cm, we cut four same circles. Calculate the percentage of waste.

Correct answer:

p =  21.46 %

Step-by-step explanation:

S1=a2=752=5625 cm r=75/4=18.75 cm S2=πr2=π18.752=1104.466 cm2  p=100(S14S2)/S1=5625100(56251104.466)=21.46% 

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