Answer:
angles are 30° , 70° , 80°
Explanation:
two angles in the ratio 3 : 8 = 3x : 8x ( x is a multiplier )
given one angle is 70°
the sum of the 3 angles in a triangle = 180°
sum the 3 angles and equate to 180, solving for x
3x + 8x + 70 = 180 , that is
11x + 70 = 180 ( subtract 70 from both sides )
11x = 110 ( divide both sides by 11 )
x = 10
Then
3x = 3 × 10 = 30
8x = 8 × 10 = 80
the 3 angles are 30° , 70° , 80°