Classifying Angles Activity | Acute and Obtuse Angles - Free Printable

Let’s go step by step to solve this problem.

We are given definitions of three types of angles:

- Right angle = exactly 90° (looks like the corner of a square)
- Acute angle = less than 90° (smaller than a right angle — looks “sharp”)
- Obtuse angle = more than 90° but less than 180° (bigger than a right angle, but not straight)

Now let’s look at each numbered angle and decide what type it is.

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Angle 1: Looks small and sharp → definitely less than 90° → Acute

Angle 2: Opens wide — bigger than a right angle, but not flat → between 90° and 180° → Obtuse

Angle 3: Has that little square mark in the corner → that means it’s exactly 90° → Right

Angle 4: Very narrow opening → much smaller than 90° → Acute

Angle 5: Also narrow, but maybe a bit wider than #4 — still clearly under 90° → Acute

Angle 6: Wide open — bigger than 90°, not straight → Obtuse

Angle 7: Has the square corner mark → exactly 90° → Right

Angle 8: Small opening — less than 90° → Acute

Wait — let me double-check Angle 8. It’s drawn with two lines forming a small V-shape. Yes, definitely acute.

Also check Angle 3 and 7 — both have the little square symbol? In the image, only Angle 3 and Angle 7 show the square corner mark? Actually, looking again — in the worksheet on the right, Angle 3 has the square, Angle 7 also has the square. So those are right angles.

Angle 1: no square, small → acute
Angle 2: wide → obtuse
Angle 3: square → right
Angle 4: very small → acute
Angle 5: small → acute
Angle 6: wide → obtuse
Angle 7: square → right
Angle 8: small → acute

All seem correct.

Final Answer:

1) Acute
2) Obtuse
3) Right
4) Acute
5) Acute
6) Obtuse
7) Right
8) Acute