Which equation can be used to solve for m∠1? m∠1 = One-half(a – b) m∠1 = One-half(a + b) m∠1 = One-half(c – d) m∠1 = One-half(c + d)

Step-by-step explanation:

The picture of the question in the attached figure

we know that

The measure of the interior angle is the semi-sum of the arches that comprise it and its opposite.

so

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for this case we must apply distributive property to the following expression:

the distributive property states that:

then, when applying the property we have to multiply the -2 for each term within the parenthesis: