Question

The circumference of a circle is 1 (1/2) times than that of the other. Find the ratio of the radii
diameters and areas of the two circles.
If the difference of the diameters of the two circles is 21 cm, find the radii of the two circles​

Answer 1

Answer:

From given we can say that 2πr=1/2 *2πR

where r is radius of 1 circe and R is another circle's radius...

By this relation we get R=2r

The ratio of R and r is 1/2 and the ratio of both areas are also 1/2

2r-r=21

Therefore r=21 and R=42

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