The radii of two circles are in the ratio 3 : 5, find the ratio between their
circumferences.
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Answers
Answered by
15
The ratio of the radii of the circles = 3 : 5
Let radius of the first circle = 3x
and radius of second circle = 5x
∴ Circumference of first circle = 2πr
= 2π x 3x = 6πx
and circumference of second circle = 2πr
= 2π x 5x = 10πx
∴ Ratio between their circumferences
= 6πx : 10πx
= 16 :10
= 3 : 5
Answered by
9
Answer:
let the ratio be 3x and 5x
Circumference of ratio = 2r
= 2 × 22/7 × 3x
= 132/7 x
Circumference of ratio = 2r
2× 22/7× 5x = 220/7x
Ratio between them =
132/7x : 220/7x
= 132 x 7x
_____ _____
7x 220
= 3/5
= 3:5 answer
Hope it is useful for you.
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