the ratio of radii of two circles is 3:5.find ; (i) the ratio of their circumferences ,(ii) the ratio of their areas
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Circumstance= 2πr so circumstance is directly proportional to radius so circumstance ratio is 3:5. Area =πr2 so area is directly proportional to r2 so area in ratio of 9:25
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1. ratio of circumfrance=2πr/2πr
=2×22/7×3/2×22/7×5
=3/5
=3:5
2. ratio of area=πr②/πr②
=22/7×3×3/22/7×5×5
=9/25
=9:25
=2×22/7×3/2×22/7×5
=3/5
=3:5
2. ratio of area=πr②/πr②
=22/7×3×3/22/7×5×5
=9/25
=9:25
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