#### Answer

Since $a$ is multiplied by $\cos$ $\theta$ the result will always be less that $a$.

#### Work Step by Step

$\cos$ $\theta$ = $\frac{r}{a}$
Therefore:
$r$ = $a$ $\cos$$\theta$
Since the angle of offset($\theta$) exists between 0$^{\circ}$ and 90$^{\circ}$, $\cos$ $\theta$ will always be less than or equal to 1.
Since $a$ is multiplied by $\cos$ $\theta$ the result will always be less that $a$.