Question

triangle abc, shown in the diagram below, is an isosceles triangle. if the measure of ∠acb is 42.5°, what is the measure of ∠abc? 132.5° 42.5° 47.5° 137.5°

Explanation:

Step1: Recall isosceles - triangle property

In an isosceles triangle $\triangle ABC$ with $AC = AB$, $\angle ABC=\angle ACB$.

Step2: Substitute the given angle value

Given $\angle ACB = 42.5^{\circ}$, so $\angle ABC=42.5^{\circ}$.

Answer:

B. $42.5^{\circ}$