In Q3 how its answer is coming 38.5

Dear Student ,

In the given figure radiusr of semicircle is =72=3.5 m So area of both semicircles=2×πr22Therefore, Area of two circle ends=2×2277222                                           =22772×72                                           =11×72=38.5m2


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4th part also explain
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Dear student ,
Here is your answer...

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no. of semi circles=2
r=7/2  
ans.-=1/2*22/7*7/22
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