Math 5Classifying 2-D Shapes

Instructor: Mrs. Tew Turner

In this lesson we will learn about classifying polygons

by their unique and common properties.

Math Warm-up

8

2 7

Math Warm-up - ANSWER

You can use multiplication to find the answer.

27 x 8 = 216

8 2 16

2 7

In this lesson we will answer the question:

How do you identify, describe, analyze, compare, and classify triangles and quadrilaterals by their properties?

Materials needed:

You will need to print out the shapes templates that goes with this lesson. You will need to cut out the shapes carefully so you can move them into groups to match the criteria you create.

Vocabulary ReviewEquilateral triangle – All sides are equal.Isosceles triangle – Two sides are the same length.Scalene triangle – No sides are the same length.Right triangle – One angle is a right angle(90º).

Vocabulary ReviewAcute triangle – All 3 angles are acute angles (less than 90º).Obtuse triangle – One angle is an obtuse angle (greater than 90º).

Vocabulary ReviewQuadrilateral – A quadrilateral is any polygon with 4 sides. Parallelogram – both pairs of opposite sides parallel and equal in length.Trapezoid – only 1 pair of parallel sides.Rectangle – a parallelogram with 4 right angles

Vocabulary Review

Rhombus – a parallelogram with all sides the same length.Square – A rectangle with all sides the same length. A square can also be called a rhombus.Generalization – A generalization can be made based on rules.

Connecting to Previous Learning

In Level 4 you explored the properties of two-dimensionalfigures. You learned right triangles as a category, and how to identify right triangles.

Connecting to Previous Learning

In the previous lesson you explored what is and what is not a polygon, while learning the 2 categories of regular and irregular polygons.

In this lesson you will continue to explore how to categorize shapes based on their common properties.

Document Camera

Get your notebook

and pencil ready.

Make sure you

have the Lesson #

and date on your

page.

Guided Practice

1. You will work with your classmates to organize your shapes. You will need to decide how the shapes are alike and different.

2. We will conclude the activity with the Doc Camera and analyze the properties of the shapes provided.

Classifying Shapes Activity

Using the Doc CameraHow did you do?

We are going to follow an online activity for practice with a 10 question quiz to follow. Use your Math Journal to write notes and answers to questions as we go through this together.http://www.mathsisfun.com/quadrilaterals.html

In your Math NotebookIndependent Practice

In this lesson we continued to explore how to categorize shapes based on their common properties.

You need to remember the properties of shapes and how they are categorized. Review the content of this lesson as many times as you need. There is so much vocabulary in geometry!

Lesson Review

Quick Check1. A square and a rhombus both

have four sides that are equal in length. How can you tell the difference between the 2 quadrilaterals?

2. Why can a rectangle also be called a parallegram?

In your Math Notebook

Quick Check ANSWER1. A square and a rhombus both

have four sides that are equal in length. How can you tell the difference between the 2 quadrilaterals?

Answer: A rhombus does not always have 4-90º angles as a square must always have. A rhombus has 2 acute and 2 obtuse angles.

In your Math Notebook

Quick Check- ANSWER2. Why can a rectangle also be called a parallegram?

A parallelogram has both opposite sides at equal distance….they are parallel. All 4 angles measure 90º, as does a rectangle. As such, the rectangle shares the properties for a parallelogram.

Today you learned how to categorize triangles and quadrilaterals.

Good Work with this

lesson.