If the sum of interior angles of a regular polygon is 2340, 340. Find the number of side

The sum of the interior angles of a polygon with $n$ sides is $(n-2) \times 180^\circ$.

Given sum = $2340^\circ$,

$$(n-2) \times 180^\circ = 2340^\circ$$

Divide both sides by $180^\circ$:

$$n-2 = \frac{2340^\circ}{180^\circ} = 13$$

$$n = 13 + 2 = 15$$

The regular polygon has 15 sides.

15