circumferences
21. The radil of two circles are in the ratio 3: 5. find the ratio between their
22. The circumferences of two circles are in the ratio 5 7 find the ratio between the
the perimeters of two squares are in the ratio 8 : 15, find the ratio between
moths of their sides.
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Answer:
The ratio of the radii of the circles = 3:5
Radius of first circle = 3x
Radius of second circle = 5x
Circumference = 2\pi r2πr
=2\pi\times3x=6\pi x=2π×3x=6πx
circumference of second circle = 2\pi r2πr
= 2\pi\times5x=10\pi x2π×5x=10πx
Ratio between their circumference
= 6\pi x:10\pi x6πx:10πx
= 16:10
= 3:5
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