Answer:
20° , 40° , 120°
Explanation:
sum the parts of the ratio, 1 + 2 + 6 = 9 parts
divide the sum of the angles in a Δ , 180° by 9 to find the value of one part of the ratio.
180° ÷ 9 = 20° ← value of 1 part of the ratio, then
2 parts = 2 × 20° = 40°
6 parts = 6 × 20° = 120°
the 3 angles are 20° , 40° and 120°