Question

Two circles have diameters in the ratio 1:3 find the ratio of their circumferences

Answer 1

Answer:

Ratio of diameters = 1:6

Let diameters be x and 6x

Circumference of a circle = $\tt{\pi d}$

Ratio of circumference = $\tt{\frac{\pi d}{\pi D}}$

=> d/D

=> x/6x

=> 1:6

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