1. WARM UPS #1
A person covered 80 yards in 20 seconds. What is his speed in feet per second? #2 #3

2. Step 1: Convert 80 yards to feet. Since 3ft=1yard. 80 x 3 = 240 feet.
WARM UPS #1
A person covered 80 yards in 20 seconds. What is his speed in feet per second?
Step 1: Convert 80 yards to feet.
Since 3ft=1yard. 80 x 3 = 240 feet.
Step 2: Find the unit rate.

3. WARM UPS #2 #3

4. VOCABULARY
INTERSECTION: A point or set of points common to two or more geometric figures.
PLANE: A plane is a flat surface that extends forever in all directions.
CROSS SECTION: The intersection of a three-dimensional figure and a plane.
PARALLEL: Lines that are side by side with the same distance between them.
PERPENDICULAR: Two lines that intersect at a right (900) angle.

5. Vertex: Corner, tip or where two lines meet
Cone
Plane
Cross Section
Base
This figure shows the intersection of a cone and a plane. The cross section is a circle.

6. This figure shows the intersection of a triangular prism and a plane
This figure shows the intersection of a triangular prism and a plane. The cross section is a triangle.

7. Triangle
Rectangle
Parallelogram
Rectangle
No, there are no curves in a rectangular prism.

8. Rectangle
Triangle
Yes No
Yes No
Yes

9. Describe the cross section of each given figure with the name of its shape.
1. Cube
2. Cylinder
Rectangle
Triangle
3. Triangular Prism
4. Cone
Semi-circle
Triangle

10. Describe how many different ways in which a plane might intersect the cylinder and the cross section that results. Draw the different ways.

11. Plane Sections of Geometric Figures.
Homework:
Plane Sections of Geometric Figures.