Discussion
An exterior angle of a triangle is 130° and one of the interior opposite angles is 60°. Find the other interior opposite angle.
Answer: C
An exterior angle equals the sum of the two interior opposite angles.
\[ 130^{\circ} = 60^{\circ} + \theta \quad\Longrightarrow\quad \theta = 70^{\circ} \]
Equivalently, the adjacent interior angle is 50°, and \( 180 - 50 - 60 = 70 \).
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