The ratio of diameters of two circles is 5: 6.find the ratio of of their circumference

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Solution

Dear student
$L e t t h e d i a m e t e r o f f i r s t c i r c l e, d_{1} = 5 x u n i t s . d i a m e t e r o f s e c o n d c i r c l e, d_{2} = 6 x u n i t s . S o, r a d i u s o f f i r s t c i r c l e, r_{1} = \frac{d_{1}}{2} = (\frac{5 x}{2}) u n i t s r a d i u s o f s e c o n d c i r c l e, r_{2} = \frac{d_{2}}{2} = (\frac{6 x}{2}) u n i t s = 3 x u n i t s S o, \frac{C i r c u m f e r e n c e o f f i r s t c i r c l e}{C i r c u m f e r e n c e o f s e c o n d c i r c l e} = \frac{2 {πr}_{1}}{2 {πr}_{2}} = \frac{\frac{5 x}{2}}{3 x} = \frac{5}{6}$
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