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
.
Answers
Answered by
6
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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