If m∠A = m∠B and m∠A + m∠C = ∠D, then m∠B + m∠C = ∠D Which property is shown?

Substitution Property

Step-by-step explanation:

So we know that:

And we also know that:

And by using a specific property, we get that:

Essentially, we substituted B for A.

So, this is an example of the substitution property, where if two sides/angles are congruent, we can substitute them for each other.

answer:      

step-by-step explanation:

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step-by-step explanation: