Angles on a Straight Line Flashcards

The sum of angles on a straight line is always 180°.

Two angles that add up to 180° are called supplementary angles.

Subtract the known angle(s) from 180° to find the missing angle.

Adjacent angles on a straight line share a common arm and add up to 180°.

A linear pair of angles is a pair of adjacent angles that form a straight line and add up to 180°.

A straight angle is an angle of 180°.

If one angle is 120°, the other angle on the straight line is 60° (180° - 120°).

If angles are expressed algebraically, set their sum equal to 180° and solve for the variable.

Angles on a straight line can include corresponding, alternate, or co-interior angles when parallel lines are involved.

Angles on a straight line can be seen in a protractor or when measuring angles in a straight road or beam.