Angle – When two rays originate from the same endpoint, then an angle is formed.Interior of an Angle – The intramural of ∠BAC is the set of all points in its plane which rest on the same side of the line AB as C and also on the same side of AC as B.Obtuse Angle – An angle that measures more than 900 but less than 1800 is known as an obtuse angle.Reflex Angle – An angle that measures more than 1800 but less than 3600 is known as a reflex angle.Complementary Angles – Two angles are denoted to be reciprocal if the sum of their measure is 900.Supplementary Angles – Two angles are said to be supplementary if the sum of their measures is 1800