# ALEX Learning Activity

## Slicing Three-Dimensional Figures and Identifying the Resulting Cross-Sections

A Learning Activity is a strategy a teacher chooses to actively engage students in learning a concept or skill using a digital tool/resource.

This learning activity provided by:
 Author: Kimberly Dockery System: Alabama Department of Education School: Alabama Department of Education
General Activity Information
 Activity ID: 2698 Title: Slicing Three-Dimensional Figures and Identifying the Resulting Cross-Sections Digital Tool/Resource: Interactivate - Cross Section Flyer Tool Web Address – URL: http://www.shodor.org/interactivate/activities/CrossSectionFlyer/ Overview: In this activity, students will use the Interactivate Cross Section Flyer Tool to discover the cross-sections that result from slicing three-dimensional figures. Students will use a graphic organizer to collect data on prisms, pyramids, and cylinders.Cross-Section Graphic Organizer
Associated Standards and Objectives
Content Standard(s):
 Digital Literacy and Computer Science DLIT (2018) Grade: 7 23) Demonstrate the use of a variety of digital devices individually and collaboratively to collect, analyze, and present information for content-related problems. Mathematics MA2019 (2019) Grade: 7 19. Describe the two-dimensional figures created by slicing three-dimensional figures into plane sections. Alabama Alternate Achievement Standards AAS Standard: M.AAS.7.19 Match two similar geometric shapes that are proportional in size and orientation.
Learning Objectives:

Students will name, draw, and describe cross-sections that result from slicing three-dimensional figures.

Students will demonstrate the use of a digital tool to analyze cross-sections of three-deminsional figures.

Strategies, Preparations and Variations
 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
 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