# Understanding the Relationship Between 2-D and 3-D Shapes

By Charlotte Cushman on Apr 24, 2017

The goal of this activity is to help students with visual impairments to understand the relationship between two-dimensional figures and three-dimensional figures.  This activity builds on prior knowledge with 2-dimensional figures and 3-dimensional figures and differentiates between the characteristics of right rectangular prisms and right rectangular pyramids.  Students will also compare the attributes of right rectangular prisms and right rectangular pyramids.

## Procedure

1.  Invite the students to examine 3-dimensional shapes and identify each of them.  Begin with basic shapes, such as a sphere, cube, and pyramid.

2.  Ask them to make the same shapes out of playdoh.

3.  Slice the playdoh into 2-dimensional pieces and ask the students to identify the shapes.  Discuss the ways in which a cube becomes a square, a sphere becomes a circle, and a pyramid becomes a triangle. 4.  Use APH Geometric Forms to match the 3-dimensional to the 2-dimensional shape.

5.  Use Wikki Stix to create tactile outlines of different shapes. 6.  Ask the students to describe the relationship between the three-dimensional shapes and the two-dimensional shapes.