Question

plz solve ex 13 in easy way by giving reasons

Answer 1

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Name diameter of circle from point A as MN.

Area of shaded region = Area of semicircle - Area of semicircle with MA diameter + Area of semicircle with AN diameter.

r1 = AM = 5cm
r2 = MB = 3cm
r3 = AN = 2cm

= 1/2π(r1)^2 - 1/2π(r2)^2 + 1/2 π(r3)^2
= 1/2× π [25 - 9 + 4]
= 1/2 × π (20)
= 10π cm^2

Perimeter = πr1 + πr2 + πr3
= π ( r1 + r2 + r3 )
= π ( 5 + 3 + 2 )
= π × 10
= 10π cm
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THANKS.......