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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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