Question

If m∠A = m∠B and m∠A + m∠C = ∠D, then m∠B + m∠C = ∠D.

Which property is shown?
reflexive property
substitution property
symmetric property
transitive property​

Answer 1

subsitution

Explanation:

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Answer 2

substitution property

Explanation:

When you replace m∠A in the second equation with its equal, as defined by the first equation, you are making use of the substitution property.

That property says you can replace anything by its equal.