Respuesta :

sushmaacharya328

Answer:

40+2x-30+x+20=180degree ( being the sum of all angle of the triangle )

or, 30+3x=180degree

or, 3x=180-30=150degree

or, x=150÷3=50degree

now, put the value of x in angle B then

angleB= 2×50-30=80degree ans.

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