Types of angles, step by step
Before a child measures an angle, they have to see it.
The question
acuterightobtuse
Is this angle acute, right, or obtuse?
Name this angle
75°vs90°
75<90
75°→acute
- Do not judge it by how big it looks — a long pair of arms makes an angle look wider than it is, and the arms are not the angle. Compare it to a RIGHT ANGLE instead; that is the one you can picture exactly.
- 75 is less than 90.
- Smaller than a right angle is ACUTE. (A useful check: it fits inside the corner of a page.)
How it works.
- 01
Do not judge it by how big it looks — a long pair of arms makes an angle look wider than it is, and the arms are not the angle. Compare it to a RIGHT ANGLE instead; that is the one you can picture exactly.
- 02
75 is less than 90.
- 03
Smaller than a right angle is ACUTE. (A useful check: it fits inside the corner of a page.)