1. Geometry
4.7 Tree Rings

2. 4.7 Cross Sections Objectives Determine the shapes of cross sections
Determine the shapes of intersections of solids and planes

3. Problem 1: Cutting a Tree Trunk
Collaborate 1-4 (6 Minutes)

4. Problem 1: Cutting a Tree Trunk

5. Problem 1: Cutting a Tree Trunk

6. Problem 1: Cutting a Tree Trunk

7. Problem 1: Cutting a Tree Trunk
Together #5
Cross Section
Square
Cross Section
Triangle
Cross Section
Rectangle
Cross Section
Hexagon
Cross Section
Pentagon

8. Problem 1: Cutting a Tree Trunk

9. Problem 1: Cutting a Tree Trunk
Collaborate 6-8 (4 Minutes)
Each group will only discuss one of the cross section problems
We will discuss all problems as a group

10. Problem 1: Cutting a Tree Trunk

11. Problem 1: Cutting a Tree Trunk

12. Problem 1: Cutting a Tree Trunk

13. Problem 1: Cutting a Tree Trunk

14. Problem 1: Cutting a Tree Trunk
Together #9

15. Problem 1: Cutting a Tree Trunk
Together #9

16. Problem 1: Cutting a Tree Trunk
Together #9

17. Check for Understanding
Which of the following are not possible cross sections of a cube? Be able to explain why, when not possible.
Hexagon
Octagon
Rectangle
Equilateral Triangle
Circle
Possible
Not Possible
Possible
Possible
Not Possible

18. Check for Understanding
Which of the following are not possible cross sections of a cube? Be able to explain why, when not possible.
Triangle that is not equilateral
Pentagon
Parallelogram that is not a rectangle
Rectangle that is not a square
Square
Possible
Possible
Possible
Possible
Possible

19. Formative Assessment
Skills Practice 4.7
Pg (1-30)