Ans: D
Note that the sum of the exterior angles of polygon is $360^\circ$ and the sum of the interior angles of a convex $n$-sided polygon is $(n-2)180^\circ$. Hence, we have
Note that the sum of the exterior angles of polygon is $360^\circ$ and the sum of the interior angles of a convex $n$-sided polygon is $(n-2)180^\circ$. Hence, we have
$\begin{array}{rcl}
(n-2)180^\circ & = & 4 \times 360^\circ \\
n – 2 & = & 8 \\
n & = & 10
\end{array}$
