Question

The difference between the area and square of radius of a circle is 105 cm. The circumference of the
circle is
(a) 22cm
(b) 44 cm (c) 308 cm (d) 154 cm
.​

Answer 1

It's too simple dear....

Area =(pi) * r^2

So.....

(pi) * r^2 - r^2

=(pi-1)r^2 = 105

=(22/7 - 1) * r^2 = 105

=(15/7)* r^2 =105

= r^2 = 49

= r = 7cm.....

Circumference = 2*pi*r

= 2*22/7*7

= 44 cm......

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