Question

triangle abc is isosceles.
what is true about the measure of angle b?
it is twice the measure of angle a.
it is twice the measure of angle c.
it is equal to the measure of angle a.
it is equal to the measure of angle c.

Explanation:

Step1: Identify equal sides

Sides AC and AB have tick marks, so AC = AB.

Step2: Relate sides to angles

In isosceles triangles, angles opposite equal sides are equal. Angle opposite AC is ∠B; angle opposite AB is ∠C. Thus, ∠B = ∠C.

Answer:

D. It is equal to the measure of angle C.