Two angles of a polygon are right angles & the remaining are 120 degrees each. Find the number of other sides in in it.

Answer 1

two exterior angles are also 90°
The remaining exterior angles (all the same), are 180-120 = 60°

The exterior angles add to 360°, so there are 3 more of them, each 60°.

The figure is a pentagon similar to a home plate in baseball.

Consider that the interior angles of a hexagon are all 120°. Drawing a diagonal between two adjacent sides will form this figure.