1. Draw a line AB. (0.5 marks)
2. Take a point O on AB and place the centre point of the protractor at O. (0.5 marks)
3. Measure the angle of 45⁰ with the baseline from the left (by reading outer measurements) and mark a point P there. (0.5 marks)
4. Join points O and P. ∠POA is the required angle of 45⁰. (0.5 marks)