GeometryAngle types
Name: Date:
Write whether each angle is acute, right, or obtuse.
1 acuterightobtuse
2 acuterightobtuse
3 acuterightobtuse
4 acuterightobtuse
5 acuterightobtuse
6 acuterightobtuse
7 acuterightobtuse
8 acuterightobtuse
Types of angles worksheets
Before a child measures an angle, they have to see it. These free printable worksheets draw an angle and ask for one of three words — acute, right, or obtuse — the standard in its plainest form.
If they get stuck
Types of angles
The answer key prints on a separate page.
What's on this sheet
No degrees are printed anywhere. Writing 47 next to the angle would answer the question, and the skill being built is recognizing the shape of a corner rather than reading a number. The measure lives in the answer key, where a parent marking the sheet can see it.
Why this sheet works
Angles keep a clear margin from 90 degrees, so no figure is a coin flip. An 88-degree angle and a right angle are indistinguishable on paper at this size, and a child who guesses wrong on one of those has learned nothing except that the sheet is unfair.
How this one works
Name this angle
140°vs90°
140>90
140°→obtuse
- 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.
- 140 is more than 90.
- Bigger than a right angle is OBTUSE. (It cannot fit inside the corner of a page — but it is still less than a straight line, which would be 180.)