Question

The ratio of the circumference to the area of a circle is 2: 21. Find the circumference
and the area of the circle.​

Answer 1

Answer:

circumference of the circle=2πr

area of the circle=πr^2

2/21=2πr/πr^2

2/21=2/r

by cross multiplication,

2r=42

r=21

circumference= 2πr=2*21*π =42π

42*22/7=132unit

area= πr^2=21^2*π =441π

441*22/7=1386 unit square

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