. Take a 10-rupee and a 5-rupee coin. Measure their diameters with the
ruler. Find the ratio of their (i) Areas (ii) Circumferences
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Given : 10-rupee and a 5-rupee coin
To Find : ratio of their (i) Areas (ii) Circumferences
Solution:
Diameter of Rs 10 coin ≈ 28 mm
=> Radius = 28/2 = 14 mm
Diameter of Rs 5 coin ≈ 22 mm
=> Radius = 22/2 = 11 m
Area = π ( radius)²
Circumference = 2 π radius
ratio of their Areas = ( ratio of radius ) ²
= ( 14/11)²
= 196/121
= 1.62
ratio of their Circumferences = ( ratio of radius )
= 14/11
= 1.27
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