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Question
Three angles of a quadrilateral are equal. Fourth angle is of measure 120°. What is the measure of equal angles?
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Solution
Let the measure of equal angles be x each.
Then, by the angle sum property of a quadrilateral, we have
x + x + x + 120° = 360°
⇒ 3x = 360° – 120°
⇒ 3x = 240°
⇒ x = 80°
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