1

Starter QuestionsStarter Questions

Q1. 35% of 360

Q2. Calculate 5 + 6 x 7

Q3. Expand 2( y – 5 )

LearningLearning IntentionIntention

To understand theTo understand the prism formula prism formula for for

calculating volume.calculating volume.

Volume of SolidsVolume of SolidsPrismsPrisms

Definition : A prism is a solid shape with uniform cross-section

Cylinder(circular Prism) Pentagonal PrismTriangular Prism

Hexagonal Prism

Volume = Area of Cross section x length

Volume of SolidsVolume of Solids

4

Any Triangle AreaAny Triangle Area

12

Area b h

h

b

Sometimes called the altitude

h = vertical height

5

Any Triangle AreaAny Triangle Area

2

18 6

224

Area

Area cm

6cm

8cm

Example 1 : Find the area of the triangle.

12

Area b h

Definition : A prism is a solid shape with uniform cross-section

Triangular PrismVolume = Area x length

Q. Find the volume the triangular prism.

20cm210cm= 20 x 10 = 200 cm

3

Volume of SolidsVolume of Solids

Volume of a Volume of a Triangular PrismTriangular Prism

4cm

4cm

10cm

= 2 x4 = 8 cm2

Working

Volume = Area x length = 8 x 10 = 80cm

3

Triangle Area =1

bh2

Example Find the volume of

the triangular prism.

Total Area = 6+6+30+40+50 = 132cm

2

3cm

6cm

30cm

= 3 x 3 = 9 cm2

Working

Volume = Area x length = 9 x 30 = 270cm

3

Triangle Area =1

bh2

Now try Ex 5.1 Pg 30 Ch 2

Volume of SolidsVolume of Solids