## Optimization

### 2 What are your thoughts and questions?

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Anonymous

Why choose to write the equation in terms of r and not h?

Matheno

Great question — thanks for asking!

That’s an arbitrary choice: we could have just as easily written the equation for h instead, and then found dA/dh in Step 4. The final answers for the values of r and h that minimize the cost would of course turn out the same as above, as you can verify if you’d like!