Question

draw a line segment ab=5.6 cm . at pointa , construct an angle of 120 degree ,using compass now construct its supplement at point a.

Answer 1

draw a line ab the construct 120 degrees at point a from line ab.
the suppplement of a angle means how much will you add to that angle to make it 180 degree therefore supplement of 120 degrees is 60 degrees so construct 60 degrees or just bisect the angle you just made.

Answer 2

Heya!! Friend

follow these steps :

Step 1 : Draw a line segment AB = 5.6 cm

Step 2 : Take any radius ( Less than half of AB ) and centre" A " draw a semicircle that intersect our line AB at " P " . Now with same radius and centre " P " draw an arc that intersect our semicircle at " Q " . With same radius and centre " Q " draw an arc that intersect our semicircle at " R " .

Step 3 : Join AR and extend it to " X " we get ∠ BAX = 120°

Step 4 : Join AQ and extend it to " Y " we get ∠ BAY = 60°

supplementary angle of 120° = 180° − 120° = 60°

Hope it will help u