Faces are flat two-dimensional surfaces of a three-dimensional object, edges are line segments where two faces meet, and vertices are points where edges meet. Learners identify and count these features on familiar solids such as cubes, rectangular prisms, pyramids, and triangular prisms, even when the solids are rotated or shown in drawings. The understanding is limited to visual identification of common figures, not formal polyhedron classification, Euler’s formula, or generalized treatment of curved surfaces.
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Detailed Explanation: Identify faces, edges, and vertices of 3D objects
A face is a flat surface.
An edge is a line segment where two faces meet.
A vertex is a corner where edges meet.
Example
Look at a rectangular prism, such as a cereal box. Count its faces, edges, and vertices.
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Count the faces.
A rectangular prism has:- a top and bottom,
- a front and back,
- a left side and right side.
So, it has 6 faces.
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Count the edges.
Each face has edges, but some edges belong to two faces, so do not count them twice. A rectangular prism has:- 4 edges around the top,
- 4 edges around the bottom,
- 4 edges connecting the top and bottom.
So, it has 12 edges.
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Count the vertices.
A vertex is a corner. There are:- 4 corners on the top,
- 4 corners on the bottom.
So, it has 8 vertices.
Therefore, a rectangular prism has:
The shape may look different when it is turned, but it still has the same number of faces, edges, and vertices.
Learn by doing: Identify faces, edges, and vertices of 3D objects
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Practice:
3D Shapes - Count Edges and Faces
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Download/Modify Free Grade 3 'Identify faces, edges, and vertices of 3D objects' Worksheet
Print this free 'Identify faces, edges, and vertices of 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:
- 3D Shapes - Count Edges and Faces
- 3D Shapes - Count Edges and Faces - First Time
- 3D Shapes - Count Faces and Vertices
- 3D Shapes - Count Faces and Vertices - First Time
- 3D Shapes - Count Edges and Vertices
- 3D Shapes - Count Edges and Vertices - First Time
- 3D Shapes - Count Faces
- 3D Shapes - Count Faces - First Time
Units Teaching This Skill
These adaptive units introduce, teach, or reinforce this skill (Identify faces, edges, and vertices of 3D objects) through scaffolded problems that grow in difficulty as concepts are understood.