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ABCD is a cyclic quadrilateral and O is the centre of the circle . if angle COD = 140 and angle BAC = 40, then value of angle BCD is equal to ?



Anglebcd=also40 bacuase 
                              oppsite angles of cyclic qudriliteral r supplemantry
2 5 2
Angle BCD=40 degrees
0 0 0
but how
how plaese explain ???
please anyone solve this circle question ....
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