1. M ATH 451 T ECH A CTIVITY 7 th Grade Geometry By Cassie Spartz spartzcm.wikispaces.com/tech+activity

2. R ESOURCES USED FOR THIS CLASS : Go to my wikispace: spartzcm.wikispaces.com/tech+activity --Documents needed found on bottom of wiki.

3. L ET ’ S R EVIEW What is a cross-section? The face that results from slicing through a solid. Play around with sliders in the GeoGebra File found on my Wikispace. After you have worked with the GeoGebra File you may use this link to find the cross-sections of a cube more accurately: 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

4. S QUARE C ROSS -S ECTION

5. E QUILATERAL C ROSS -S ECTION

6. R ECTANGLE C ROSS -S ECTION

7. S CALENE T RIANGLE C ROSS -S ECTION

8. P ENTAGON C ROSS -S ECTION

9. H EXAGON C ROSS -S ECTION

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

11. 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.

12. 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.

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

14. 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….