1. Cross Sections of Three- Dimensional Figures Return to table of contents

2. 3-Dimensional figures can be cut by planes. When you cut a 3-D figure by a plane, the result is a 2-D figure. The cross-sections of 3-D figures are 2 dimensional figures you are familiar with. Look at the example on the next page to help your understanding.

3. A horizontal cross-section of a cone is a circle. Can you describe a vertical cross-section of a cone?

4. A vertical cross-section of a cone is a triangle.

5. A water tower is built in the shape of a cylinder. How does the horizontal cross-section compare to the vertical cross-section?

6. The horizontal cross-section is a circle. The vertical cross-section is a rectangle

7. 9Which figure has the same horizontal and vertical cross-sections? A B C D

8. 10Which figure does not have a triangle as one of its cross-sections? A B C D

9. 11Which is the vertical cross-section of the figure shown? ATriangle BCircle CSquare DTrapezoid

10. 12Which is the horizontal cross-section of the figure shown? ATriangle BCircle CSquare DTrapezoid

11. 13Which is the vertical cross-section of the figure shown? ATriangle BCircle CSquare DTrapezoid