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Let $WXYZ$ be a trapezoid with bases $\overline{XY}$ and $\overline{WZ}$.  In this trapezoid, $\angle ZXW = 90^\circ$, $\angle XWZ = 60^\circ$, and $\angle XYZ = 120^\circ$.  Find $\angle XZW$, in degrees.

 Apr 30, 2024
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In fact, you have more information than enough to determine the angle. 

 

Note that ZXW,XWZ,XZW are the 3 interior angles of WXZ, so they should add up to 180.

Then,

90+60+XZW=180

XZW=30

 

The information about Y can be arbitrary, it does not affect the answer.

This particular condition on Y (i.e., XYZ=120) just makes the diagram easy to draw because it is an isosceles trapezoid, i.e., WX = YZ. 

 Apr 30, 2024

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