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**Understanding Solid Figures**

A Mini Lesson by Diana Dell

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**What is a solid figure? A solid figure is a three-dimensional figure.**

“Three- dimensional” means that the figure has measures in three directions, such as length, width, and height.

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**Examples of solid figures:**

cube sphere triangular prism triangular pyramid square pyramid cylinder rectangular prism cone

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**What are the parts of a solid figure?**

The face is the flat surface of a solid figure. The vertex is the point where three or more edges of a solid figure meet. The vertex is sometimes called a corner. vertex The edge is the line segment where two faces of a solid figure meet.

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**What are the parts of a solid figure?**

The base is the face of a solid figure by which the figure is named. base

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**Examine some solid figures by watching this video clip.**

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**Some solid figures have a curved surface.**

cone cylinder curved surface

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**What’s the difference between a prism and a pyramid?**

A solid figure whose base is a polygon and whose other faces are triangles with a common vertex is a pyramid. These are pyramids.

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**What’s the difference between a prism and a pyramid?**

A solid figure whose ends are congruent, parallel polygons, and whose sides are rectangles is a prism. These are prisms.

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**Practice counting vertices:**

Remember to count the vertices that you can’t see. 8 4

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**Practice counting faces:**

Remember to count the faces that you can’t see. 4 6 1

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**Click on the solid figure described below.**

I have one base and one vertex. No, a cylinder has 2 bases. No, this pyramid has 4 vertices! Yes, a cone is correct.

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**Click on the solid figure described below.**

I have 6 square faces and 8 vertices. No, this prism does not have square faces. No, this pyramid has triangular faces. Yes, cube is correct!

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What are we learning today? We will learn the names of 3D shapes. We will learn how they are made up. We will learn new ways to describe them. We will.

What are we learning today? We will learn the names of 3D shapes. We will learn how they are made up. We will learn new ways to describe them. We will.

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