Angle classification worksheet for identifying acute, obtuse, right, straight, and reflex angles.

Let’s go through each angle one by one and classify it based on what we know:

We remember from the top of the worksheet:
- Acute = less than 90° (small, sharp angle)
- Right = exactly 90° (like the corner of a square)
- Obtuse = more than 90° but less than 180° (wide, open angle)
- Straight = exactly 180° (looks like a straight line)
- Reflex = more than 180° (the big “outside” part of an angle)

Now let’s look at each angle in order — left to right, top to bottom.

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First row:

1. First angle: Looks like a perfect L-shape → that’s a right angle.
2. Second angle: Smaller than a right angle → acute.
3. Third angle: Bigger than a right angle, but not flat → obtuse.

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Second row:

4. Fourth angle: The arc goes around the outside — it’s bigger than a straight line → reflex.
5. Fifth angle: Again, looks like an L-shape → right.
6. Sixth angle: Small, pointy angle → acute.

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Third row:

7. Seventh angle: Almost flat, but slightly bent — the arc shows it’s just under 180°? Wait — actually, looking closely, the arc is drawn on the *inside*, and it’s clearly less than 180°, but more than 90° → so obtuse.
- Correction: Actually, wait — this one is tricky. The lines are almost straight, but the arc is drawn on the smaller side. Since it’s less than 180° and more than 90°, yes — obtuse.
8. Eighth angle: The arc goes all the way around the outside — definitely more than 180° → reflex.
9. Ninth angle: Wide open, but not quite flat — more than 90°, less than 180° → obtuse.

Wait — let me double-check #7 and #9.

For #7: The two lines form an angle that’s clearly wider than 90°, but not 180° — so obtuse is correct.

For #9: Same thing — wide, but not straight — obtuse.

And #8: The circle-like arc means it’s going the long way around — reflex.

Okay, I think I’ve got them all.

Let me list them again in order:

Row 1: Right, Acute, Obtuse
Row 2: Reflex, Right, Acute
Row 3: Obtuse, Reflex, Obtuse

That seems consistent with the definitions.

Final Answer:
Angle: right
Angle: acute
Angle: obtuse
Angle: reflex
Angle: right
Angle: acute
Angle: obtuse
Angle: reflex
Angle: obtuse