Question

if the measure of angle 1 is 120 degrees, what is the measure of angle 3? * 1 point your answer

Explanation:

Step1: Identify angle relationship

Angles 1 and 3 are adjacent supplementary angles (they form a linear pair), so their sum is \(180^\circ\).

Step2: Calculate angle 3

Let \(m\angle 3\) be the measure of angle 3. We know \(m\angle 1 = 120^\circ\) and \(m\angle 1 + m\angle 3 = 180^\circ\). So, \(m\angle 3 = 180^\circ - 120^\circ\).
\(m\angle 3 = 60^\circ\)

Answer:

\(60\) degrees