# Roark Melissa Geometry

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```					Melissa Roark
Math Institute
Lesson Plan – Geometry
“Venn Diagrams for Polygons & Solid Figures”

INTRODUCTION
Venn diagrams will be used in this lesson to help students compare / contrast
various geometric shapes and figures. This lesson could be used for grades 4-5, adapting
the content appropriately. Students will need to have already learned basic polygons
and/or solid figures in order to complete this lesson. Students will also need to be
familiar with various geometric terms for describing flat shapes and solid figures (like
faces, vertices, edges, parallel, congruent, symmetrical, perpendicular). The goal of this
lesson is two-fold. First, students will use math vocabulary related to polygons and solid
figures to fill in a Venn diagram comparing and contrasting two polygons or solid
figures. Then, students will use this information to write complete sentences discussing
the similarities and difference between the two shapes or figures.

OBJECTIVES
Students will be able to…
1. Use a Venn diagram to organize similarities and difference between two
polygons and/or two solid figures (depending on grade level).
2. Use information from a Venn diagram to construct a coherent paragraph in
sentence form comparing and contrasting the two flat shapes and/or solid
figures.

MATERIALS
Variety of solid figures
Variety of flat shapes
Pencils
Venn diagram
Lined-paper

PA STANDARDS CONNECTION
Geometry
2.3.5L – Identify properties of geometric figures

INSTITUTE CONNECTION
I thought of this lesson idea after we did a similar activity in our breakout
session on Day 1. The activity was called, “Roping in Quadrilaterals.” For this
activity, we were given a set of quadrilaterals and we had to group them so that they
could be put into a Venn diagram. I adapted this activity for my lesson. Instead of using
multiple quadrilaterals, I will be using flat shapes (all shapes) and solid figures. Also,
students will just choose two shapes/figures to compare/contrast with the Venn diagram.

1
PROCEDURES
Bell Ringer:
Ask students to describe a Venn diagram. Be sure to ask what it looks like, how it
is labeled, when it is used, and what you can do with the information on it. Write
their ideas on the board. Explain to students that the purpose of today’s lesson is
to use a Venn diagram to compare and contrast two flat shapes or two solid
figures. Tell students they will want to fill in their Venn diagrams neatly and with
the most information that they can because they will use those diagrams to write a
paragraph description of the similarities and differences.

Guided Practice:
1. Pass out one Venn diagram to each student. Tell students that we will do one
together as a class first. Then, they will have to complete one individually.
2. Ask students to choose which shapes/figures they want to use for the class example.
Draw a large Venn diagram on the board. Hold up the two shapes/figures that were
chosen. Ask students what you should do first on the Venn diagram once you know
what two things you will be looking at.
3. Label the two circles of the Venn diagram. Then have students take two minutes to
look at the two shapes/figures and write down information on their Venn diagrams.
4. Students share with class. If teacher can think of more information that the class
hasn’t come up with, ask leading questions so that they will think of it.
5. Once the Venn diagram is completed, pass out lined paper to each student and write
the paragraph as a class by asking students for sentences. Explain to students that the
paragraph would best be organized with all of the similarities together and all of the
differences together.

Independent practice:
Students will repeat the above activity by themselves. They will select which two
flat shapes or solid figures they want to use. Students will only complete the
Venn diagram part first. The written paragraph description will be completed as
an assessment task after students share their Venn diagrams with other classmates
in the closure activity.

CLOSURE
Share your Venn Diagram with a partner. Read what you have as similarities and
differences from your Venn diagram and see if your partner can guess which two flat
shapes or solid figures you are talking about. Repeat with another partner if there is time.

ASSESSMENT
Students will individually write a coherent paragraph with complete sentences
comparing and contrasting the two flat shapes or solid figures from their Venn diagrams.
This paragraph will be collected along with the Venn diagram.

SOURCES
2007 Mathematics Institute Binder – Day 1, worksheets 2-9

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