Related Rates

AP Calculus AB· difficulty 3/5

4

A
$r = 4h$
B
$r = \tfrac{2h}{5}$
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C
$r = h$
D
$r = \tfrac{5h}{2}$

Explanation

\frac{r}{h} = \frac{4}{10} = \frac{2}{5}

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