Question

Sum of the interior angles of a polygon is `3060^@`. How many sides does it have?

Answer 1

The interior angle sum is `(n-2)xx180^o`, where n is the number of interior angles.

Explanation:

So triangle `(3-2)xx180^o=180^o`,
Quadrangle `(4-2)xx180^o=360^o`,
Etc.

`(n-2)xx180^o=3060^o->n-2=3060^o/180^o=17->n=19`

This is also the number of sides.