Question

1. a linear pair is a pair of adjacent angles whose non - common sides are opposite. what is their total degree measure? 90° 180° 270° 360°

Explanation:

A linear pair of angles forms a straight line. A straight - line angle has a measure of \(180^{\circ}\). By the definition of a linear pair (adjacent angles with non - common sides as opposite rays), the sum of the measures of the two angles in a linear pair is equal to the measure of a straight - line angle.

Answer:

\(180^{\circ}\) (the second option)