Answer :
In a triangle, the three interior angles always add to 180°
x + 3x + 5x = 180
9x = 180
x = 180/9
x = 20
the smallest angle = x = 20°
x + 3x + 5x = 180
9x = 180
x = 180/9
x = 20
the smallest angle = x = 20°