# Solution: What is the percentage increase in its diameter when the surface area of a sphere increases?

Given a sphere of a diameter, d. What is the percentage increase in its diameter when the surface area increases by 21%?

#### Problem Statement: ECE Board November 1992

Given a sphere of a diameter, d. What is the percentage increase in its diameter when the surface area increases by 21%?

The percentage increase in its diameter is 10%.

Solution:

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