In a. quadrilateral ABCD ,LA =150 degree, LB=LC=LD, find LB,LC,and LD.
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La=150, let LB=LC=LD=x
So we can say 150+X+X+X=360 (sum of all angles of a quadrilateral is 360°)
150+3x= 360
3x=360-150
3x=210
x=210/3
x=70
Therefore LB=LC=LD=70°
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