Understanding Solid Figures

1. Understanding Solid Figures A Mini Lesson by Diana Dell

2. 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.

3. Examples of solid figures: cube sphere triangularprism triangular pyramid squarepyramid cylinder rectangularprism cone http://www.harcourtschool.com/glossary/math_advantage/definitions/solid_f5.html

4. 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.

5. What are the parts of a solid figure? • The base is the face of a solid figure by which the figure is named. base

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

7. Some solid figures have a curved surface. cone cylinder curved surface

8. 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.

9. 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.

10. Practice counting vertices: Remember to count the vertices that you can’t see. 8 0 4

11. Practice counting faces: Remember to count the faces that you can’t see. 4 6 1

12. 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.

13. 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!