Related rates - Snowball melts, surface area decreases at given rate (Matheno.com)

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Calculus related rates problem & solution: "A snowball symmetrically such that it is always a sphere. Its surface area decreases at the rate of .... How fast is its radius changing at the instant when r = ...?" Let's solve this together, step-by-step, and illustrate a strategy you can use to solve *every* related rates problem.

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I've been pulling my hair out trying to solve this problem only to find the Diameter at which it is decreasing... and your bit about web-based homework already taking the negative sign into account... saved me!

Thanks so much!

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