Question

Circumference of a circle is 90cm more than it's diameter. Find its radius

Answer 1

Let the diameter be x.
So ,Circumference =x+90
radius =x/2
2×22/7×x/2=x+90
22x/7=x+90
22x=7x+630
15x=630
x=42
Radius =42/2=21cm
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