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Community fitness design
The length of AD is 20020 = 10m.

DE=AB2 can be obtained from Pythagorean theorem? AE2=6cm，

∴ The area of semi-circular dining area is S = 12π× (6 ÷ 2) 2 = 92π m2.

A: The semicircular dining area is 92 π m2.

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