Question
The surface area of a sphere is 2,464 cm2. If
the sphere is cut into two equal pieces, then find the total surface area of each hemisphere thus formed. (Take π = 22/7)Solution
Area of hemisphere = 3πr {where ‘r’ is the radius}
Surface area of sphere = 4πr2 (Where ‘r’ is the radius)
Let radius of the given sphere ‘r’ cm
ATQ;
2464 = 4 × (22/7) × r × r
Or, r2Â = 196
So, r = 14
Required area = 3 × (22/7) × 14 × 14 = 1,848 cm2
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