Question

what is the missing angle if its supplementary to the measure shown? (image: a straight line with a ray forming a 129° angle and a ? angle. multiple - choice options: 63, 19, 82, 51)

Explanation:

Step1: Recall supplementary angles property

Supplementary angles sum to \(180^\circ\). Let the missing angle be \(x\). So, \(x + 129^\circ= 180^\circ\).

Step2: Solve for \(x\)

Subtract \(129^\circ\) from both sides: \(x = 180^\circ - 129^\circ\).
Calculate: \(x = 51^\circ\).

Answer:

51