Question

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)

Answer 1

`m\angle 1=(1)/(2)(arc\ a+arc\ b)`

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

`m\angle 1=(1)/(2)(arc\ a+arc\ b)`