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If an angle is its own complement, what is its measure?

  • A.30°
  • B.45°
  • C.60°
  • D.90°

Answer: B

\[ x = 90 - x \quad\Longrightarrow\quad 2x = 90 \]

\[ x = 45^{\circ} \]

An angle that is its own supplement would be 90° instead.

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