A quadrilateral has three acute angles each measures 80°. What is the measure of the fourth angle?
A quadrilateral has three acute angles each measures 80°. What is the measure of the fourth angle?
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Sum of angles of a quadrilateral is 360°
Let the fourth angle is x°
80° + 80° + 80° + x° = 360°
x° = 360° - 240°
x° = 120°
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