IreneD
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In a trapezoid, three interior angles measure 80°, 100°, and 140°. What is the measure of the fourth interior angle.

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cupcakequeen23
The fourth angle will be 40 degrees
RyanGNR1080
All four-sided figures' interior angles will always add up to 360*. Therefore, the final angle is 40*, found by adding up all the values you have and subtracting them from 360. 

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