Common three-dimensional objects are identified and distinguished by their defining attributes, including flat or curved surfaces, faces, edges, and vertices; examples include cubes, rectangular prisms, pyramids, cones, cylinders, and spheres. The understanding includes recognizing the same solid in different orientations and distinguishing a solid from the two-dimensional shapes that may form its faces. Volume, surface area, nets, and formal classification of solids are beyond this scope.
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Detailed Explanation: Identify common 3D objects
A 3D object is a solid shape. You can identify it by looking at its surfaces, faces, edges, and vertices:
- Flat face: a flat surface, often shaped like a square, rectangle, or triangle
- Curved surface: a surface that bends
- Edge: where two faces meet
- Vertex: a corner where edges meet
Remember: a face is a 2D shape on a solid, but the whole object is 3D. For example, a square can be a face of a cube, but the cube is not a square.
Worked example
Problem: A solid has 6 flat, square faces. It has 12 edges and 8 vertices. What object is it?
Step 1: Look at the faces.
All the faces are flat and square.
Step 2: Count the parts.
The solid has 6 faces, 12 edges, and 8 vertices.
Step 3: Match the attributes.
These attributes match a cube.
Answer: The solid is a cube.
A cube is still a cube if it is turned or tilted. It may look different from another cube, but its defining attributes stay the same.
Learn by doing: Identify common 3D objects
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Practice:
Simple 3D Shapes
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Download/Modify Free Grade 3 'Identify common 3D objects' Worksheet
Print this free 'Identify common 3D objects' worksheet to practice this skill away from the computer. Click 'Modify' to easily customize this worksheet to your exact needs.
This Worksheet Includes:
- Simple 3D Shapes
- Simple 3D Shapes (Real World)
- Complex 3D Shapes
- Complex 3D Shapes (Real World)
- Simple 3D Shapes - Reversed
- Simple 3D Shapes (Real World) - Reversed
- Complex 3D Shapes - Reversed
- Simple 3D Shapes - Is Specific Type
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