Identify 3D Shapes Worksheet - Color the shapes according to the given color code.

Let’s go step by step to identify each 3D shape and assign the correct color based on the instructions:

Instructions:
- cubes → red
- cuboids → yellow
- spheres → green
- pyramids → blue
- cylinders → pink
- triangular prisms → grey

We’ll go row by row, left to right.

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Row 1:

1. Cube – All sides equal, square faces → red
2. Pentagon (flat) – This is a 2D shape, not 3D → skip (not shaded)
3. Square pyramid – Base is square, triangular faces meet at top → blue
4. Right triangle (flat) – 2D shape → skip

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Row 2:

5. Sphere with dot – Round ball shape → green
6. Cylinder – Circular bases, curved side → pink
7. L-shape (flat) – 2D → skip
8. Cuboid (rectangular prism) – Like a box, rectangular faces → yellow

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Row 3:

9. Triangular pyramid (tetrahedron) – Triangle base, three triangular faces → still a pyramid → blue
10. Cube – Again, all sides equal → red
11. Triangular prism – Two triangular ends, rectangular sides → grey
12. Square pyramid – Same as #3 → blue

Wait — let’s double-check #9 and #12. Both are pyramids (even if different types), so both are blue.

#11 is definitely a triangular prism → grey

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Row 4:

13. Triangular prism (lying down) – Still has two triangular faces → grey
14. Ellipsoid or oval sphere? – It’s round but stretched — in elementary math, this is often treated as a sphere → green
- Note: The small dot might be just decoration. Shape is 3D and round → we’ll call it a sphere.
15. Tall cuboid – Rectangular prism, just taller → still a cuboid → yellow
16. Cylinder (on its side) – Still a cylinder → pink

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Now let’s list all shapes that should be colored, with their colors:

✔ Row 1:
- Cube → red
- Square pyramid → blue

✔ Row 2:
- Sphere → green
- Cylinder → pink
- Cuboid → yellow

✔ Row 3:
- Triangular pyramid → blue
- Cube → red
- Triangular prism → grey
- Square pyramid → blue

✔ Row 4:
- Triangular prism → grey
- Ellipsoid/sphere → green
- Tall cuboid → yellow
- Cylinder (sideways) → pink

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Double-check for mistakes:

- Are there any other 3D shapes? We skipped flat ones correctly.
- Did we misclassify any?

→ The ellipsoid (#14): In most school worksheets, unless specified otherwise, any round 3D object is called a “sphere” even if slightly oval. So green is correct.

→ Pyramids: All pyramids (square base, triangular base) are grouped under “pyramids” → blue. Correct.

→ Prisms: Only triangular prisms are mentioned → grey. The cuboids are separate → yellow. Correct.

→ Cylinders: Even sideways → pink. Correct.

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Final Answer:

Here’s what to shade:

Red (cubes):
- First shape (top left)
- Tenth shape (third row, second from left)

Yellow (cuboids):
- Eighth shape (second row, far right)
- Fifteenth shape (fourth row, third from left)

Green (spheres):
- Fifth shape (second row, first)
- Fourteenth shape (fourth row, second from left)

Blue (pyramids):
- Third shape (first row, third)
- Ninth shape (third row, first)
- Twelfth shape (third row, fourth)

Pink (cylinders):
- Sixth shape (second row, second)
- Sixteenth shape (fourth row, far right)

Grey (triangular prisms):
- Eleventh shape (third row, third)
- Thirteenth shape (fourth row, first)

All other shapes are 2D — do not shade them.

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Final Answer:
Shade the following shapes with these colors:

- Red: cube (row 1, col 1), cube (row 3, col 2)
- Yellow: cuboid (row 2, col 4), tall cuboid (row 4, col 3)
- Green: sphere (row 2, col 1), ellipsoid/sphere (row 4, col 2)
- Blue: square pyramid (row 1, col 3), triangular pyramid (row 3, col 1), square pyramid (row 3, col 4)
- Pink: cylinder (row 2, col 2), sideways cylinder (row 4, col 4)
- Grey: triangular prism (row 3, col 3), lying triangular prism (row 4, col 1)

Do not shade any 2D shapes (pentagon, L-shape, triangle).