【HaiChuan: Using your brain keeps you young】Calculate the area of this shadow

2018-03-24View Original

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It is a square with sides of 4 centimeters; semicircles are drawn along all four sides as shown. What is the area of this shaded region?

Reply #22018-03-24

Area = 3.14 × 9.12 square centimeters

Reply #32018-03-24

The shaded area, oh! It doesn’t even seem to be half that big!

Reply #42018-03-25

8(π-2) is approximately equal to 9.12

Reply #52018-03-25

8(π-2) is approximately equal to 9.12

Reply #62018-03-26

This post was last edited by Duan Yu Wang Yuyan on 2018-3-26 08:36: 8pai-16

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【HaiChuan: Using your brain keeps you young】Calculate the area of this shadow

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