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Angles are in the ratio of 2:1:3 ,so angles will be 2x:x:3x, &on sum of right angle triangle is always 180 degree 2x+x+3x=180 6x=180 x=30 degree 2x=2*30=60 degree 3x=90 degree when an angle of triangle becomes 90 degree it becomes right angle triangle.

W.k.t the sum of the angles of a triangle=180 let the angles of a triangle be 2x, x,3x so 2x+x+3x=180 6x=180 x=180/6=30x=30 2x=60 3x=90 since in a triangle one angle is 90 it is a right angle triangle