Using the parallelogram method of vector addition, add the following two vectors. The reference direction is horizontal and directed from left to right. Angles are measured counter-clockwise from the reference direction.

A = 4 units, 20°.
B = 3 units, 60°.

Please follow the steps carefully, in the order given.

Step 1: First indicate the reference direction and the scale:

Step 2: Draw a light pencil line parallel to the reference direction at the start of vector A, i.e, the point 0:

Step 3: Using a protractor, measure an angle of 20° counterclockwise from this line and draw a line 4 cm long in this direction from the point 0. Label vector A and indicate its direction:

Step 4: Using a protractor, measure an angle of 60° counterclockwise from the light pencil line and draw a line 3 cm long in this direction, from point 0. Label vector B and indicate its direction:

Step 5: Using a ruler and a set-square, draw a line parallel to A from the terminal point of B:

Step 6: Using a ruler and a set-square, draw a line parallel to B from the terminal point of A:

Step 7: The resultant R is a vector drawn from 0 to the point of intersection of these two lines:

Step 8: Measure the length and direction of R.