the radii of two circles are in the ratio 3 :5 find the ratio between their circumference .
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Let circumference of 1st circle is = C1
& circumference of 2nd circle is = C2
C1/C2 = 2×pie × r1 / 2×pie×r2
= 2×pie×3/ 2×pie×5
=3/5
= 3:5
& circumference of 2nd circle is = C2
C1/C2 = 2×pie × r1 / 2×pie×r2
= 2×pie×3/ 2×pie×5
=3/5
= 3:5
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