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aright circular cylinder just encloses a sphere of radius 20cm. find ratio of the sphere's surface area to cylinder's CSA |
Answer» Given :-Radius of Sphere(r) = 20cm To find :-Ratio of the SPHERES surface area to cylinders CSA. We know That :-FORMULA -Surface Area of A sphere = 4πr² 4πr² = 4 × π × 20 × 20 ---1 CSA of CYLINDER = 2πr 2πr = 2 × π × 20 ---2 Solution :-Ratio of the spheres surface area to cylinders CSA = 1/2 By substituting 1 & 2 values we GET 4 × π × 20 × 20. ------------------------ = 2 × 20 = 40 2 × π × 20 |
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