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What are the four basic types of angles in mathematical common sense? Introduction of four basic angles in mathematics common sense.
The four basic types of 1. angle are right angle, acute angle, obtuse angle and right angle.

2. "dihedral angle"-dihedral angle (meaning "two starting points") is one of the four angles formed by the intersection of two non-parallel planes. "complementary angle"-two angles add right angles, that is, they are complementary angles. For example, two acute angles in a right triangle are always considered to be complementary, because their sum is equal to 90 degrees of the right angle. . "Complementary Angle" —— Two angles add up to a flat angle (180) to be complementary angles. If two angles are complementary angles of the same angle, then the two angles are congruent.