Question

1. finish the equation: ( mangle2 + 129^{circ}=) ____ ( ^{circ})

a. 90
b. 360
c. 45
d. 180
what is the measure of angle 2?

Explanation:

Step1: Recall the property of supplementary angles

Supplementary angles add up to \(180^{\circ}\). If \(m\angle2\) and \(129^{\circ}\) are supplementary, then \(m\angle2 + 129^{\circ}=180^{\circ}\).

Step2: Solve for \(m\angle2\)

Subtract \(129^{\circ}\) from both sides of the equation \(m\angle2 + 129^{\circ}=180^{\circ}\).
\(m\angle2=180^{\circ}- 129^{\circ}\)
\(m\angle2 = 51^{\circ}\) (but the first part of the question is about the sum of the two angles which are supplementary)

Answer:

D. \(180\)