12. Find the missing angles of the quadrilateral ACBD in the given figure.
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In Triangle ADC By angle sum property of triangle
40+70+ADC=180
ADC=180-110
ADC=70
Now in Triangle DBC
As DB=BC
So Angle BCD=BDC=x
So in triangle DBC by angle sum property of triangle
80+ x + x = 180
2x=100
x=50
So BCD=BDC=50
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