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In cyclic quadrilateral WXYZ, angle ZYW = 10 degrees and angle YOW = 100 degrees.  Find angle YWZ.

 

 Jan 12, 2020
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Since angle(YOW) = 100o, arc(YZW) = 100o.

Since angle(ZYW) = 10o, arc(ZW) = 20o.

Subtracting, arc(YZ) = 80o.

Angle(YWZ) = ½Arc(YZ) = 40o.

 Jan 13, 2020

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