Description
In Lesson 7, students examine the relationship between a cross-section and the base of a general cone. Students understand that pyramids and circular cones are subsets of general cones just as prisms and cylinders are subsets of general cylinders. In order to understand why a cross-section is similar to the base, there is discussion regarding a dilation in three dimensions, explaining why a dilation maps a plane to a parallel plane.
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From EngageNY.org of the New York State Education Department. Geometry Module 3, Topic B, Lesson 7.
Available from engageny.org/resource/geometry-module-3-topic-b-lesson-7; accessed 2015-05-29.
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