Step 1:
Draw a straight line. Call it AB. Mark a point on AB and call it O.


Step 2:
Place the protractor's base line over AB with its centre on O.


Step 3:
Reading the scale from left, mark Point C so that ∠AOC is 60°.
Join Point C to Point O and mark ∠AOC as 60°.


Alternatively, you can read the scale from right and mark Point D so that ∠BOD is 60°.
Join Point D to Point O and mark ∠BOD as 60°.

Step 1:
Draw a straight line RS.

Step 2:
Place the protractor's base line over RS with its centre on S.

Step 3:
Read the scale from 0° at R and mark Point T so that ∠RST is 135°.
Join Point S to Point T and mark ∠RST as 135°.


Here are two more ways of drawing ∠RST equal to 135°.