Unit 4: Estimating, Time, and Shapes

# Topic C: Shapes

# Circle

The circle is a shape we all know.

These objects suggest the idea of a circle:

- rim of coffee cups and glasses
- top of lamp shades top of cans of food
- compact discs
- the ends of pipes and hoses (called the cross-section)
- the coloured part of your eye (the iris)

Add some examples of your own.

# Triangle

A **triangle **is a three-sided shape. Triangles have **three sides **and **three angles**.

Draw some different sized triangles here.

# Rectangle

A **rectangle **is a four-sided shape. Rectangles have four sides and four **right **angles (square corners).

Can you think of anything that has a rectangle shape? Write it here.

# Square

A **square **is a special kind of rectangle. Squares have square corners and all four sides are the same length.

Can you think of anything that has a square shape? Write it here.

Exercise 1

The following things give the idea of a shape. Write the name of the shape in each blank. Then draw the shape.

**Example: **

A cookie is a circle.

- A door is a .
- This page is a .
- A yield sign is a .
- A room is usually a .
- A coin is a .
- A ten dollar bill is a .
- The rim of a jar is a .
- This warning sign is a .
- A pizza is a .

**Answers to Exercise 1**

- rectangle
- rectangle
- triangle
- rectangle
- circle
- rectangle
- circle
- triangle
- circle

Exercise 2

Look around the room and find each of the following shapes. Write the name on the line. Have your instructor check your answers.

**Example:**

A rectangle door.

- A circle .
- A rectangle .
- A square .
- A triangle .

Exercise 3

Circle the correct shape in each line. Have your instructor check your answers.

- A rectangle

- A circle
- A square
- A triangle

Exercise 4

What shape are the following things? Write **triangle, square, rectangle or circle**.

**Answers to Exercise 4**

- circle
- triangle
- rectangle
- square
- rectangle or triangle
- circle
- square
- rectangle