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Important Points

1 . Two angles are complementary if their sum is 90° .

2 . Two angles are supplementary if their sum is 180° .

3 . The sum of all the angles round a point is equal to 360° .

4 . Adjacent angles : Two angles are called Adjacent angles if they have a common arm, have the same vertex and uncommon arms are on either side of the common arm .

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where 1 and 2 are adjacent angles

5 . Transversal : A line which intersects to or more given lines at distinct Points , is called a transversal a given line .

6 . Know about corresponding angles , Alternate interior angles , Alternate exterior angles and consecutive interior angles

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7 . If a transversal intersects to parallel Lines , then each pair of corresponding angles are equal , Alternate interior angles are equal and interior angles on the same side of the transversal are supplementary .