A triangle.
It is a right angle triangle
A right scalene triangle.
Providing that it is a regular polygon it will have 8 sides.
If the only information that you have is the angle and the shape is a polygon, then you cannot determine how many sides the polygon consists of. The minimum number of sides is 3, but without seeing a picture, or knowing what type of polygon (e.g. right triangle or equalaterial triangle), then you won't be able to determine how many sides the polygon has.
2
A polygon with 3 vertices and 3 sides is known as a triangle. If it has one right angle, it is specifically a right triangle. In a right triangle, one of the angles measures 90 degrees, and the other two angles are acute, adding up to 90 degrees to complete the total of 180 degrees for all three angles.
It will have 360/120 = 3 sides
well if its 120 degrees it must have 3 sides
It is the right angle triangle which has 3 sides whereas all quadrilaterals have 4 sides.
The minimum number of sides for a polygon is 3 sides.
The longest side is always opposite the right angle so the sides of the right angle are 3 and 4 units.
360/3 = 120 sides