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Answer :

Saharamagar2020go

Step-by-step explanation:

Let angle b be x

Let angle a be 4x

Let angle c be 5x

Then,

      4x+x+5x=180(sum of angle of a triangle is 180)

   or,10x=180

   or,x=180/10

      x=18

angle a=4x=4*18=72

angle b=18

angle c=5x=5*18=90

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