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12. Geometry
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United States of AmericaTennessee
Grade 5

12.01 Properties of shapes

Lesson
Practice
Lesson

Are you ready?

Can you identify a 2D shape using its basic properties?

What is the name of the shape in the picture below?

  1. Triangle

    A

    Rectangle

    B

Learn

This video will show you how to work out the name of a 2D shape based on its properties. 

Vocabulary:

A polygon is a 2D shape that is made of straight lines and is closed.

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Question 1

Which of the following shapes are rectangles? Choose all correct answers.

  1. A

    B

    C

    D

 

Learn

This image shows the different categories of quadrilaterals and their properties. A pair of angled markings means two opposite sides are parallel. If any two sides have the same straight markings then they have the same length.

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Question 2

Select all parallelograms:

  1. A

    B

    C

    D

    E

    F

 

Remember!

The features of 2D shapes help us know which shape we are looking at, such as:

  • the number of sides, including any that are equal or parallel
  • the number of angles, including any that are right angles

Outcomes

5.G.B.3

Classify two-dimensional figures in a hierarchy based on properties. Understand that attributes belonging to a category of two-dimensional figures also belong to all subcategories of that category. For example, all rectangles have four right angles and squares are rectangles, so all squares have four right angles.

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