Right angles.
Just call them "congruent angles".
In the context of two parallel lines and an intercept, they are called interior angles.
A parallelogram.
They are supplementary angles.
a complementary angle
supplementary
a line or supplementary angles.
Angles that have the same measure are called congruent angles.
An equilateral triangle has 3 congruent angles that add up to 180 degrees.
Isosceles
A regular polygon such as a square or an equilateral triangle ..... etc .....
182