Preassessment 2d and 3d Shapes | PDF - Free Printable

Let’s go step by step to fill in the correct names, edges (sides), and vertices (corners) for each shape.

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Part 1: 2D Shapes

We’ll look at each flat shape one by one.

Shape 1: Triangle
- Name: Triangle
- Edges (sides): A triangle has 3 straight sides.
- Vertices (corners): It has 3 corners where the sides meet.

Shape 2: Square
- Name: Square
- Edges: 4 equal straight sides.
- Vertices: 4 corners.

Shape 3: Pentagon
- Name: Pentagon (5-sided polygon)
- Edges: 5
- Vertices: 5

Shape 4: Circle
- Name: Circle
- Edges: A circle has no straight edges — it’s curved all around. So we say 0 edges.
- Vertices: No corners → 0 vertices.

Shape 5: Hexagon
- Name: Hexagon (6-sided polygon)
- Edges: 6
- Vertices: 6

Shape 6: Octagon
- Name: Octagon (8-sided polygon)
- Edges: 8
- Vertices: 8

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Part 2: 3D Shapes

Now let’s do the solid shapes. We count faces (flat surfaces), edges (where two faces meet), and vertices (corners).

Shape 1: Cube
- Name: Cube
- Faces: A cube has 6 square faces.
- Edges: Each face has 4 edges, but they’re shared — total is 12 edges.
- Vertices: 8 corners.

Shape 2: Rectangular Prism (or Cuboid)
- Name: Rectangular Prism
- Faces: Still 6 faces (like a box).
- Edges: Also 12 edges.
- Vertices: 8 corners.

Shape 3: Triangular Pyramid (Tetrahedron)
- Name: Triangular Pyramid (or Tetrahedron)
- Faces: 4 triangular faces (including the base).
- Edges: 6 edges (each triangle shares edges with others).
- Vertices: 4 corners (one on top, three on the base).

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✔ Let’s double-check:

For 2D:
- Triangle: 3,3 ✔️
- Square: 4,4 ✔️
- Pentagon: 5,5 ✔️
- Circle: 0,0 ✔️
- Hexagon: 6,6 ✔️
- Octagon: 8,8 ✔️

For 3D:
- Cube: 6 faces, 12 edges, 8 vertices ✔️
- Rectangular Prism: same as cube → 6,12,8 ✔️
- Triangular Pyramid: 4 faces, 6 edges, 4 vertices ✔️

All correct!

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Final Answer:

Part 1: 2D Shapes

Triangle
edges: 3
vertices: 3

Square
edges: 4
vertices: 4

Pentagon
edges: 5
vertices: 5

Circle
edges: 0
vertices: 0

Hexagon
edges: 6
vertices: 6

Octagon
edges: 8
vertices: 8

Part 2: 3D Shapes

Cube
faces: 6
edges: 12
vertices: 8

Rectangular Prism
faces: 6
edges: 12
vertices: 8

Triangular Pyramid
faces: 4
edges: 6
vertices: 4