Angle Namer
The size of the marked angle is written on it. Which word names that angle?
The angle opens 177°, which is past the quarter turn of 90° but has not reached the straight line of 180°, so it is obtuse.
What to say if they get stuck
- Hold the corner against a quarter turn. Does it open less far than a square corner, or further?
- A straight line is 180°, which is two square corners side by side. Anything smaller than one square corner is acute.
- Put the printed size next to 90 and next to 180, and see which side of each it falls on.