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If ∠P + ∠Q = 240 and ∠R = 90, find the remaining angle of the quadrilateral PQRS.

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A vertex is the corner of the shape while a face is a flat surface and an edge is a straight line between two faces.


If ∠P + ∠Q = 240 and ∠R = 90, find the remaining angle of the quadrilateral PQRS.






 
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