## Lesson: Plane Shapes and Solid Shapes

Developing the Concept

Review the ideas taught in Introducing the Concept. Explain to children that they will be using pictures and models to learn more about shapes and their attributes.

**Materials:** sets of shape cards, blank construction paper, tracing paper, dot paper, dot-paper transparency, scissors, pencils, solid-shape manipulatives in the shapes of cubes, pyramids, rectangular prisms, cones, cylinders, and spheres. Have 2 to 3 manipulatives for each shape.

**Preparation:** Create a set of shape cards that includes varying sizes of rectangles, squares, circles, and triangles. Make at least enough cards for each child to get one shape. Make a sign for each of the plane and solid shapes, writing the name of the shape on the sign. Create a dot-paper transparency with several different plane shapes on it. Using a sheet of construction paper folded in half, cut out an irregular shape that has a line of symmetry along the fold. Spread manipulatives out on a table or desk. Hand out sheets of construction paper and dot paper to each child, along with a pair of scissors.

**Prerequisite Skills and Concepts:** Children should be familiar with the names and attributes of plane and solid shapes. They should have experience in drawing and labeling shapes and in working with manipulatives.

**Wrap-Up and Assessment Hints**

Children will need practice working with shapes to become familiar with their names and attributes. Take the opportunity each day to draw their attention to different shapes around the classroom or other places you frequent, such as the library. Encourage them to identify the names and attributes of the shapes. Ask them to point out pairs or groups of shapes that are congruent and shapes that have one or more lines of symmetry.