Average Rate of Change of a Polar Function

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Consider the polar function $r(\theta)= 5+ 3\cos(\theta)$ . What is the average rate of change of $r$ with respect to $\theta$ over the interval $[0, \frac{\pi}{2}]$ ?

$\theta$ (radians)	$r(\theta)$
$0$	$8$
$\frac{\pi}{2}$	$5$

$-\frac{6}{\pi}$

$\frac{3}{\pi}$

$\frac{6}{\pi}$

$-\frac{3}{\pi}$

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