an exterior angle of a triangle measure 120 degree and its interior opposite angle are in the ratio 7 : 5 find the angle of the triangle
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Answer:
In triangle
one exterior angle =sum of two opposite angles
let the opposite angles be 5x snd 7x
120=5x+7x
120=12x
120/12=x
10=x
first angle=5x=5×10=50degree
second angle =7×10=70degree
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