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a + 56 + 85 = 180
a=39
2b + 56 = 180
b = 62
c+b = 180
c = 118
c+d+a=180
d= 23
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Answer:
a= 180°- (56°+85°)--------(linear pair)
= 39°
b= 180°- 56°---------(isosceles triangle)
= 124°/2
= 62°
c= 180°- 62° = 118 °
d= 180°-(39°+118°)---------(sum of angles in a triangle is 180°)
= 23°
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