Question

7 multiple choice 1 point what is the measure of angle 1 in the figure below? 120° 40° 80° 30° 60°

Explanation:

Step1: Recall angle - sum property

The sum of adjacent angles on a straight - line is 180°.
Let the measure of angle 1 be \(x\). Then \(x + 120^{\circ}=180^{\circ}\).

Step2: Solve for \(x\)

Subtract 120° from both sides of the equation: \(x=180^{\circ}-120^{\circ}\).
\(x = 60^{\circ}\)

Answer:

\(60^{\circ}\)