Acute angles
regular polygons
An angle of 58 degrees is classified as an "acute angle." Acute angles are defined as angles that measure less than 90 degrees.
Equiangular Polygon...
If 2 of its interior each measure 30 degrees then it is an isosceles triangle
right angles
They are called congruent angles.
rectangle.
Square.
4 right angles, by definition, are four angles of the same measure, and therefore must be congruent angles.
A contraction
Equaliteral Triangle
Equilateral