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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Step-by-step Solution
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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