Classify triangles by their angles in this Grade 3 Geometry Worksheet.

Let’s go triangle by triangle and figure out what kind of angle each one has — acute, obtuse, or right.

Remember:
- A right triangle has one angle that is exactly 90 degrees (like the corner of a square). It often has a little square mark in the corner to show it’s 90°.
- An acute triangle has ALL angles less than 90 degrees — they all look “sharp” or pointy.
- An obtuse triangle has ONE angle that is bigger than 90 degrees — it looks “wide” or “blunt”.

Now let’s check each triangle:

1. Top left: Has a little square in the top angle → that means it’s a right triangle.
2. Top middle: All angles look sharp and smaller than 90° → acute.
3. Top right: Has a little square in the bottom right corner → right.
4. Middle left: One angle looks wide and bigger than 90° → obtuse.
5. Middle center: All angles are small and pointy → acute.
6. Middle right: The top angle looks wide → obtuse.
7. Bottom left: Has a little square in the bottom left → right.
8. Bottom middle: One angle is clearly wider than 90° → obtuse.
9. Bottom right: All three angles look equal and sharp → acute.

Let me double-check:
- Right triangles: #1, #3, #7 → yes, they have the square marks.
- Acute: #2, #5, #9 → all angles < 90°, no wide angles.
- Obtuse: #4, #6, #8 → each has one big angle > 90°.

Looks good!

Final Answer:
Top row: right, acute, right
Middle row: obtuse, acute, obtuse
Bottom row: right, obtuse, acute