What is the justification for105 angle Share with your friends Share 0 Shruti Tyagi answered this Dear student, Step 1: Draw and angle of 120 using protractorStep 2: Draw angle of 90 using the protractor.As we know 120+902=2102 =105Hence if we bisect the arc between 120 and 90, we will get 105° angle.Step 3: From point where 90 is made, make an arc.Step 4: From the point where 120 angle is formed, make another arc using compass.Step 5: Point where both arc's bisect is angle 105°. Regards 1 View Full Answer Mayank Panjiyara answered this it is formed by bisecting 120 and 90 degree angles 0