Discussion
The angle which is four times its supplement is:
Answer: B
\[ x = 4(180 - x) \quad\Longrightarrow\quad x = 720 - 4x \]
\[ 5x = 720 \quad\Longrightarrow\quad x = 144^{\circ} \]
Checking: the supplement is 36°, and \( 4 \times 36 = 144 \).
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