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Mathematics 13 Online
OpenStudy (anonymous):

a quadrilateral ABCD,

OpenStudy (anonymous):

Is it a Cyclic Quadrilateral?

OpenStudy (apoorvk):

|dw:1332504580765:dw| A+B+C+D=360 A+60+130+D=360 A+D=170 DIVIDE BY 2, A/2 +D/2 = 85 ....(i) now in triangle APD, angle APD = 180-(A/2 + D/2) put the value from equation (i) angle APD = 180-85 =95 degrees.

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