The measure of BCA (in figure) :
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AOB = 50
OBC = 90 (linear pair)
OAC = 90 (linear pair)
AOQ + OBC + OAC + BCA = 360 (angle sum property of quadrilateral)
50 + 90 + 90 + BCA = 360
BCA = 360 - 180 - 50
BCA = 180 - 50
BCA = 130
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ur answer is 30 hope it goes well
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