If a Snowball Melts So That Its Surface Area Decreases $4 \mathrm {~cm} ^ { 2 } / \mathrm { min }$

Short Answer

If a snowball melts so that its surface area decreases at a rate of $4 \mathrm {~cm} ^ { 2 } / \mathrm { min }$ , find the rate at which the diameter decreases when the diameter is $37 \mathrm {~cm}$ .