Answer :

Given that,

The angles of the triangle are (x – 40o), (x – 20o) and ( – 10o)


We know that,


Sum of all angles of triangle is 180o.


Therefore,


x – 40o + x – 20o + – 10o = 180o


2x + – 70o = 180o


= 250o


5x = 250o * 2


5x = 500o


x = 100o


Therefore, x = 100o


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