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**Adjacent Angles **

**LINEAR PAIR Two adjacents angles are said to form a linear pair of angles if their non-common arms are two opposite rays.**

**VERTICALLY OPPOSITE ANGLES Two angles formed by two intersecting lines having no common arm are called vertically opposite angles.**

**ANGLES AT A POINT Angles formed by a number of rays having a common initial point are called angles at a point.**

**COMPLEMENTARY ANGLES If the sum of the measures of two angles is `90^@` then the angles are called complementary angles and each is called a complement of the other.**

**SUPPLEMENTARY ANGLES Two angles are said to be supplementary angles if the sum of their measures is `180^@` and each of them is called a supplement of the other.**

**Parallel lines**

**Parallel rays**

**Parallel segments**

**Remarks It should be noted that if two lines are not parallel then they intersect. Thus two lines in a plane are either parallel or intersecting.**