Turnbull Davison
01/24/2023 · Middle School

12. Angles \( A \) and \( B \) are a pair of alternate interior angles on a pair of parallel lines intersected by a transversal, and \( \angle A \) and \( \angle C \) are a pair of same-side interior angles on the same figure. If \( \mathrm{m} \angle B=30^{\circ} \), what is \( \mathrm{m} \angle C \) ?

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Given that angles \( A \) and \( B \) are alternate interior angles formed by a transversal intersecting two parallel lines, we know that: \[ \mathrm{m} \angle A = \mathrm{m} \angle B \] Since it is given that \( \mathrm{m} \angle B = 30^\circ \), we have: \[ \mathrm{m} \angle A = 30^\circ \] Next, angles \( A \) and \( C \) are same-side interior angles. The property of same-side interior angles states that they are supplementary when the lines are parallel. Therefore, we can write: \[ \mathrm{m} \angle A + \mathrm{m} \angle C = 180^\circ \] Substituting the value of \( \mathrm{m} \angle A \): \[ 30^\circ + \mathrm{m} \angle C = 180^\circ \] To find \( \mathrm{m} \angle C \), we subtract \( 30^\circ \) from both sides: \[ \mathrm{m} \angle C = 180^\circ - 30^\circ = 150^\circ \] Thus, the measure of angle \( C \) is: \[ \boxed{150^\circ} \]

Quick Answer

The measure of angle \( C \) is \( 150^\circ \).
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