Geometry

• Share with you group what you know about geometry.

Let’s brainstorm

• What ideas about geometry did you hear in your groups discussion?

• What ideas did you have about geometry?• What kinds of shapes are studied in

geometry?• What kinds of relationships are studied in

geometry?

Journal

• Write your name• Turn to the page titled: “What I Know

About Geometry”• Summarize your ideas about geometry in

the space provided. (one to two sentences)

• At the end of this study you will get to go back and revise.

What we know about Three Dimensional Shapes

POLYHEDRA

Prisms Pyramids

Cones PrismsCylinders

Three dimensional shapes

• Display the entire collection where each member of the group can see them.

• What do you already know about three-dimensional shapes?

• How would you describe three-dimensional shapes?

Sort

• Sort the shapes into the classes displayed on the chart.

• If you are not sure about any of the shapes, set them aside.

• Next, discuss the characteristics with your group.

Polyhedra

• What are the properties of polyhedra?• What is true about the face of the

polyhedra?• What is true about all the polyhedra?

• Does anyone have a question about polyhedra?

POLYHEDRA

Polyhedra are 3D shapes with faces that are polygons. Since the faces are polygons, all of the edges are straight.

Prisms and Pyramids

• Discuss in your group how prisms and pyramids are different.

Prisms and Pyramids

• What are the properties of prisms?• What are the properties of pyramids?• In what ways are prisms and pyramids

different?• What is true about all prisms?• What is true about all pyramids?• Does anyone have a question about

either?

POLYHEDRA

Polyhedra are 3D shapes with faces that are polygons. Since the faces are polygons, all of the edges are straight

Prisms Pyramids

A 3D shape that has two congruent polygons for bases. The other faces are polygons that have exactly four edges

A pyramid has one base which is a polygon and is used to name the pyramid. The other faces are triangles

Cones, cylinders, and spheres

• Discuss with your group the ways that cones, cylinders, and spheres are alike and different.

Cones, cylinders, and spheres

• What are the properties of cones?• Cylinders?• Spheres?• In what ways are cones, cylinders, and spheres

alike?• Different?• What is true about all cones? Cylinders?

Spheres?• Any questions?

POLYHEDRA

Polyhedra are 3D shapes with faces that are polygons. Since the faces are polygons, all of the edges are straight

Prisms Pyramids

Cones SpheresCylinders

A 3D shape that has two congruent polygons for bases. The other faces are polygons that have exactly four edges

A pyramid has one base which is a polygon and is used to name the pyramid. The other faces are triangles

A 3D shape with a flat circular base and a curved surface that forms a point called an apex

3D shape with 2 congruent, flat circular bases, and a curved surface that joins them

A curved surface that is shaped like a ball. Every part of the surface is the same distance from the center.

In what ways are prisms named?

• Prisms are most often named by their bases, the two ends that are congruent, parallel polygons.

• A rectangular prism has rectangles for bases.

• Pyramids are also named by their base.• A square pyramid has a square base.

In journals

• Turn to page with the heading “What I Know About Three-Dimensional Shapes”

• Write what you know about each class of 3 dimensional shapes and draw an example of a shape that belongs to each group.