Lesson Notes By Weeks and Term - Primary 3

Week 8

Subject: Mathematics

Class: Primary 3

Term: 3^rd Term

TOPIC: Shapes

SUBTOPIC:�� 3-dimensional shapes

BEHAVIOURAL OBJECTIVES: At the end of the lesson, pupils should be able to:

1. Distinguish between open and close shapes
2. State the properties of close shapes
3. Appreciate the presence and use 3 dimensional shapes in Homes.
4. Identify right angle,acute and obtuse andle in a plane shape.
5. Distinguish between horizontal and vertical.

CONTENT

Cube

A cube has 8 vertices

A cube has 12 equal edges

A cube has 6 equal faces

Cuboid

A cuboid has 8 vertices

A cuboid has 12 unequal edges

A cuboid has 6 unequal faces

Cylinder

A cylinder has one curved face

It has two flat faces

It has no vertex

Sphere

A sphere has one curved face only.

Curved face

It has no edge and no vertex.

Cone

A cone has 1 vertex

A cone has 1 curved face

A cone has 1 flat face (i.e. a closed cone)

A cone has 1 edge

Exercise

Object� � � � � � � � � � � � � �Number of vertices��� Number of edges���� �Number of faces

1. Maggi cube
2. Die
3. Concrete block
4. Tin of milk
5. Football
6. Sugar cube
7. Ice-cream cone
8. Box
9. Class-room

Exercise 1

Study the pictures above along with other solid objects around the class

and classify them into open and closed objects.

Observations

1. Open object do not have a cover at the top. The inside of an open object can be seen,

because it has no cover or top face.

2. The inside of a close object cannot be seen because of the cover or top face.

Study this table carefully

� � � � � � � � � � � � � � � � � � � � � �Open object���������������������������� Closed object

Cube No of vertices� � � � � � � � � � � �8� � � � � � � � � � � � � � � � � � � � � � 8

No of edges� � � � � � � � � � � � � � � � �12� � � � � � � � � � � � � � � � � � � � � 12

No of faces� � � � � � � � � � � � � � � � � �5� � � � � � � � � � � � � � � � � � � � � � 6

Cuboid No of vertices� � � � � � � � � � 8� � � � � � � � � � � � � � � � � � � � � � �8

No of edges� � � � � � � � � � � � � � � � �12� � � � � � � � � � � � � � � � � � � � � �12

No of faces� � � � � � � � � � � � � � � � � �5� � � � � � � � � � � � � � � � � � � � � � �6

Cylinder No of curved faces� � � � � � 1� � � � � � � � � � � � � � � � � � � � � � 1

No of flat faces� � � � � � � � � � � � � � � 1� � � � � � � � � � � � � � � � � � � � � � 2

No of vertices� � � � � � � � � � � � � � � � 0� � � � � � � � � � � � � � � � � � � � � � 0

Note:

1. Tubes, pipes, straws are special cylinders with no flat face. They are known as hollow

cylinders. The two ends are open.

2. A sphere is always a closed objects.

Exercise 2

Copy and complete this table, stating whether the following solids are open or closed objects.

Name of shape���� Open����������� Closed

Bucket

Cup

Refrigerator

Ice-cream cone

Ludo die

Cube of sugar

Tin of milk

Tin of Milo

Tin of tomato

�

1. Copy and complete the table drawn below.

Number of faces���� Number of edges������ Number of vertices

closed cube

closed cuboid

open cube

open cuboid

closed cylinder

open cylinder

sphere

cone

�

Copy and complete the following.

1. A three-dimensional shape having equal faces _____________.
2. A cuboid has _____________ unequal faces.
3. The face of a cuboid is a _____________.
4. A cylinder has _____________ flat circular faces.
5. A cone has _____________ edge.
6. An open shoe box has _____________ faces