Question

.In cyclic quadrilaterABCD, measure angleA + measure angleB = 150 and measure angleB + measure angleC = 190 find measure angleD.

Answer 1

A+B+B+C=150+190
A+C+2B=340(A+C=180 as it is cyclic quadrilateral)
B=80
B+D = 180 (cyclic quad.)
finally find out D
D=100
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