Question

two angles are when they have the same measure. if ∠a and ∠b are congruent angles, then m∠a = m∠b the measure of angle a is equal to the measure of angle b. and ∠a ≅ ∠b. angle a is congruent to angle b.

Explanation:

Congruent angles are defined as angles with equal measures. If two angles have the same measure, they are congruent. The notation $m\angle A=m\angle B$ shows equality of measures and $\angle A\cong\angle B$ shows congruence.

Answer:

The blank should be filled with "congruent".