Symbol
Problem
$\square$ $2$ $4a^{6}\right)$ $2$ $720$ $n$ $6$ 6,12 $\left(n=2\right)\times 180=x$ $80n$ $-3b0\div x$ $2a$ $2\right)\times$ $360n-360=x$ $20$ $A$ A polygon has $n$ sides. When the number of sides is doubled, the interior angle $1s$ increased by $30^{°}$ Find the value $Ofn$ n. $13\right)$