TEKS

3.6A

classify and sort two‐ and three‐dimensional figures, including cones, cylinders, spheres, triangular and rectangular prisms, and cubes, based on attributes using formal geometric language​

2D figures were wrapped up and reviewed already​

I will use geometric language, faces, vertices, and edges, to describe 3D figures.

Language Objectives

I can review 3D figures using geometric language: faces, vertices, and edges.

Success Criteria

What will we learn today?

2D figures were covered and reviewed already.

A face is a flat surface on a 3D shape​

For example: a cube has 6 faces​

Faces​

1. Start with two opposite faces.​

2. Go around the shape until you have counted all faces.​

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I like to count twice to double check!

How to Count Faces

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A vertex is a point where two or more line segments meet

The plural of vertex is vertices

Vertex

1. Start with the vertices on one side.

2. Count the remaining vertex or vertices.

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I like to count twice to double check!

How to Count Vertices

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A line that joins 2 vertices. Where 2 faces of a solid meet.​

For example: a cube has 12 edges​

Edges​

1. Start with the edges on one side.

2. ​Count the edges on the opposite side.

3. Count the remaining edges.

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I like to count twice to double check!

How to Count Edges

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Count faces, edges, and vertices for each 3D shape.

Work until you have a smart score of at least 80.​

IXL

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​Write the number of faces, edges, and vertices for each 3D shape.

​​Worksheet

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