1. M ATH 451 T ECH A CTIVITY By Cassie Spartz spartzcm.wikispaces.com/

2. L ET ’ S R EVIEW What is a cross-section? The face that results from slicing through a solid. GeoGebra File: https://spartzcm.wikispaces.com/Tech+Activity Play around with the cross sections of this cube at: http://www.pbslearningmedia.org/asset/mgbh_int_xsection/ http://www.pbslearningmedia.org/asset/mgbh_int_xsection/ What are some cross-sections of a cube? Square Equilateral Triangle Rectangle Scalene Triangle Pentagon Hexagon Non-rectangular Parallelogram

3. S QUARE C ROSS -S ECTION

4. E QUILATERAL C ROSS -S ECTION

5. R ECTANGLE C ROSS -S ECTION

6. S CALENE T RIANGLE C ROSS -S ECTION

7. P ENTAGON C ROSS -S ECTION

8. H EXAGON C ROSS -S ECTION

9. N ON -R ECTANGULAR P ARALLELOGRAM C ROSS -S ECTION

10. G RADE 7 M ATHEMATICS S TANDARDS Geometry Draw, construct, and describe geometrical figures and describe the relationships between them. Describe the two-dimensional figures that result from slicing three-dimensional figures, as in plane sections of right rectangular prisms and right rectangular pyramids. Solve real-life and mathematical problems involving angle measure, area, surface area, and volume.

11. O BJECTIVE A main concept of geometry in 7 th grade is learning and utilizing cross-sections of objects. Utilizing knowledge of cross-sections in real life applications.

12. A SSESSMENT Go to Kahoot.it to assess what we have discussed about cross-sections.

13. R EAL L IFE C ROSS -S ECTIONS What are some ways we can apply cross-sections in real-life? Geography and Exploration Estimate ages of trees Foods Cells in Science And many more….