well all the angle added together is 180 degrees.
but you can have multiple variations of the three angles inside.
one example could be 60 degrees on all three angles.
another example could be 90 degrees, 45 degrees, and 45 degrees
Only if the polygon is "regular".
Only when it is a regular polygon that all interior angles are of equal measure
Only when the polygon is a regular convex polygon. Such as an equilateral triangle, or a square, or a regular pentagon.
A regular polygon with each interior angle measuring 120 degrees is a hexagon.
Each interior angle will measure 162 degrees
A regular polygon having an interior angle measure of 168o has 30 sides and is called a triacontagon.
Only if the polygon is "regular".
Only when it is a regular polygon that all interior angles are of equal measure
If the measure of an interior angle of a regular polygon is 140o, the polygon is a nonagon (sometimes called an ennagon) having 9 sides.
A pentagon (five sided regular polygon) has interior angles of 108°.
The measure of each interior angle of a fifteen sided regular polygon, a pendedecagon, is 156o.
A 13 sided regular polygon
The interior angle of an octdecagon, an 18 sided regular polygon, is 160o.
A regular polygon with 4 sides is a square. The measure of any interior angle of a square is 90 degrees.
A regular hexagon.
Only if the polygon is a "regular" one.
Only when the polygon is a regular convex polygon. Such as an equilateral triangle, or a square, or a regular pentagon.