Let the angles of triangle are 3x , 4x & 5x
Since the sum of all three angles of a triangle = 180
therefore 3x+4x+5x = 180
or, 12x = 180 ; solving we get, x = 180/12 = 15
hence angles of the triangle are ,
3x = 3*15=45°
4x = 4*15=60°
5x = 5*15=75°
Hence Answer 45° , 60° , 75°
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