Greater than 0° but less than 90°
Acute angle
Exactly 90°
Right angle
Greater than 90° but less than 180°
Obtuse angle
Exactly 180°
Straight angle
Greater than 180° but less than 360°
Reflex angle
Exactly 360°
Full angle
Sum of two angle is equal to 90°
Complementary angles
Sum of two angle is equal to 180°
Supplementary angle