Phase: | During/Explore/Explain |
Activity: | Prior to completing this activity, ensure the students have an understanding of the difference between vertical and horizontal slicing of three-dimensional figures. Students also need to understand when a slice is made through a three-dimensional figure, the result is a two-dimensional figure called a cross-section. One effective way to illustrate these concepts is through the use of play-dough three-dimensional models. Demonstrate both horizontal and vertical slices with string so the students visually see the resulting two-dimensional cross-sections. Have students turn and talk about the resulting cross-section and then share their observations with the class. Pass out the graphic organizer for students to complete using the Interactivate Cross Section Flyer digital tool. Students can complete the activity in groups of 3-4 or independently. |
Assessment Strategies: | Exit Ticket: Display a three-dimensional figure that was not used within the lesson and have the students name the cross-sections resulting from vertical and horizontal slices. (Example: cone) The teacher will observe students as they use the digital tool. |
Advanced Preparation: | Create play-dough models of three-dimensional figures prior to the lesson. Visit the website Interactivate Cross-Section Flyer to become familiar with manipulating the figures. Students will need access to the Interactivate Cross-Section Flyer Website. Copies of the graphic organizer for students to complete either individually or in groups. |
Variation Tips (optional): | If there is not technology available, the activity can be modified by allowing the students to complete the graphic organizer independently using play-dough models. |
Notes or Recommendations (optional): | Interactivate Cross-Section Flyer is a free resource. |
Keywords and Search Tags: | 3D, 7th grade, crosssection, crosssections, geometry, graphic organizer, interactive, math, slice, slicing, three dimensional, threedimensional figure, threedimensional figures, two dimensional, twodimensional figure, twodimensional figures |