Question

Angle of a triangle are in the ratio 2:3:4 find the perimeter of angle

Answer 1

let the angle be x
2x+3x+4x = 180 (sum of all angles in a triangle)
9x=180
x= 20

2x= 40
3x=60
4x=80

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Answer 2

let 2:3:4 = 2x:3x:4x

we know, angle of a triangle = 180°

⇒2x + 3x + 4x = 180°

⇒9x = 180°

⇒x = 180°/9

⇒x = 20°

Now, 2x=2×20°=40°

        3x=3×20°=60°

        4x=4×20°=80°