Answer the following:
1) calculate the value of x
2) calculate the size of each angle
include full working to achieve brainliest.

The sum of all interior angles in a polygon is
180(n - 2), where n = the number of sides in the polygon.

now, notice this figure above, it has 5 sides, namely is a PENTAgon, so the sum of all its interior angles is 180( 5 - 2), or 540, therefore

The correct answer is $90