From the meaning of the question, the sum of the angles in the triangle is 180 degrees, that is, angle 1+ angle 2+ angle 3= 180 degrees-formula 1.

And angle 2=2 angle 1 angle 3=3 angle 2.

Replace Angle 2 with Angle 1: Angle 3=6 Angle 1.

The first formula is: angle 1+2 angle 1+6 angle 1= 180, that is, 9 angle 1= 180 degrees.

Then:

Angle 1=20 degrees

Angle 2=40 degrees Angle 3= 120 degrees.