- ARs 492.80
- BRs 246.40
- CRs 985.60
- DRs 123.20
Step-by-Step Solution
Surface area = 4*π*. Cost = 24.64 * 20 = Rs 492.80.
Answer: A) Rs 492.80
A spherical water tank of radius 1.4 m is to be painted on the outside.
Painting costs Rs 20 per square metre.
Find the total cost of painting the tank (take π = 22/7).
Class 9Surface Area of a SphereMensuration
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