Question

what is the measure, in degrees, of ∠abc?
155°
77.5°
65°
25°
90°

Explanation:

Step1: Recall linear - pair property

$\angle ABC+\angle CBD = 180^{\circ}$ (linear - pair of angles)

Step2: Solve for $\angle ABC$

$\angle ABC=180^{\circ}-\angle CBD$. Given $\angle CBD = 155^{\circ}$, then $\angle ABC=180 - 155=25^{\circ}$

Answer:

C. $25^{\circ}$