# Related rates intro

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### Problem

The radius of a sphere is increasing at a rate of 7, point, 5 meters per minute.
At a certain instant, the radius is 5 meters.
What is the rate of change of the surface area of the sphere at that instant (in square meters per minute)?
Please choose from one of the following options.
The surface area of a sphere with radius r is 4, pi, r, start superscript, 2, end superscript.