Question

Find the ratio of the circumferences of two circles whose radii are in the ratio 4:5

Answer 1

Heya!

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Let radius of circles be x

Radius of first circle= 4x
Radius of second circle= 5x

Circumference of circle= 2πr

Circumference of first circle= 2×π×4x
Circumference of second circle= 2×π×5x

Ratio of the circumferences= Circumference of first circle/Circumference of second circle

= 2×π×4x/2×π×5x
= 4x/5x
= 4/5
= 4:5
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Hope it helps...!!!