1.

The area of a semicircle of radius 4r is(a) 8πr2 (b) 4πr2 (c) 12πr2 (d) 2πr2

Answer»

(a) 8πr2

We know that, area of semicircle = πr2/2

Then, the area of a semicircle of radius 4r is = (π(4r)2)/2

= 16πr2/2

= 8πr2



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