4.3: Topic C- Shapes

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Topic C: Shapes

Circle

The circle is a shape we all know.

$a medium size red circle, a small yellow circle, a big blue circle$

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. $three different sized triangles in different colours$

Draw some different sized triangles here.

Rectangle

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

$three different sized rectangles in different colours$

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. $three different sized circles in different colours$

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.

$a circle$

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 _____ .

$a warning sign with three sides and three angles$

i. 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. A rectangle

$a circle, a rectangle, a square, a triangle$

b. A circle

$a square, a triangle, a rectangle, a circle$

c. A square

$a rectangle, a circle, a square, a triangle$

d. A triangle

$a triangle, a square, a circle, a rectangle$

Exercise 4

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

$a round clock$
$a pine tree$
$a cell phone$
$a chess board$
$a photograph of a house$
$a bowl$
$a frying pan with 4 corners and 4 equal sides$
$the Canadian flag$

Answers to Exercise 4

circle
triangle
rectangle
square
rectangle or triangle
circle
square
rectangle

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Topic C: Shapes