In isosceles ΔABC, the vertex angle is ∠A. What can you prove?(1 point)

Question

Responses

m∠B = m∠C
m∠B = m∠C

∠A ≅ ∠B
∠A ≅ ∠B

BC¯¯¯¯¯¯¯¯≅AC¯¯¯¯¯¯¯¯
line segment cap b cap c is congruent to line segment cap A cap c

AB = CB

Answer 1

In an isosceles triangle ΔABC, where ∠A is the vertex angle, the key property is that the two base angles (∠B and ∠C) are equal. Therefore, the correct statement you can prove is:

m∠B = m∠C

This follows from the definition of an isosceles triangle, where the angles opposite to the equal sides are also equal.