Using only a ruler, draw an acute angle, an obtuse angle, a right angle and a reflex angle.

 Using a protractor, find the measure of each of the following angles :

 Using a protractor, find the measure of each of the following angles :

 Using a protractor, find the measure of each of the following angles :

Find the reflex angle corresponding to $45°$

Find the reflex angle corresponding to $90°$

Find the reflex angle corresponding to $57°$

Find the reflex angle corresponding to $120°$

State the kind of angle formed between east and north.