You already know how to measure an angle that is already drawn on the page. Today the job flips: I will give you a size, and you draw the angle to match.

Each angle was drawn in three moves: mark the dot, rule the baseline, then count round to the target and mark it, and rule the second ray through that mark. Here are four angles drawn to a target: 60°, then 95°, then 135°, then a tricky 175° that is almost a straight line. For each one, look at where the ray lands against the scale.

The 175° one is the one to watch: the ray is nearly flat, so a tiny slip changes the reading a lot.

Today we draw these angles together on the board: 110°, then 75°, then 90°. The whole class calls out the size and predicts where the ray has to land, then a volunteer comes up to set it on the board.