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# The ratio of the diameters of two circles is $3:4$, then find the ratio of their circumferences.

**Given:** The ratio of the diameters of two circles is $3:4$.

**To do: **To find the ratio of their circumferences.

**Solution: **

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Let $d_1$ and $d_2$ are the diameters of the two circles.

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Here, as given, ratio of the diameter of two circles, $d_1:d_2=3:4$

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Ratio of circumference$=2\pi r_1:2\pi r_2$ [$r_1$ and $r_2$ are the radii of the circles ]

$=\pi d_1:\pi d_2$

$= d_1:d_2$

$=3:4$

Thus, the ratio of the circumference of the two circles is $3:4$.

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