# Perimeter

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```					                                    Perimeter
Level D

Units of length
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Perimeters
Area Counting squares
Area Rectangle
Area of Triangle

24-Nov-11   Created by Mr. Lafferty Maths Dept.
Starter Questions
Level D

Q1.          Does 5m = 500cm
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Q2.          Find two numbers that multiply to give 18
and subtract to give 3.

Q3.          Write 583 000 in words.

Q4.          True or false    10  9  3 10  13  13
24-Nov-11                Created by Mr. Lafferty Maths Dept.
Units of Length
Level D

Learning Intention                                       Success Criteria
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1.      To explain the 4 metric                      1. To know the 4 units of
units of length and how to
convert between them.                                  length.
2. Be able to convert
between them.

24-Nov-11                    Created by Mr. Lafferty Maths Dept.
Units of Length
Level D                              The 4 units of length are :

The metre : This is the standard unit of length and is
approximately the distance from your nose
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100 th
to the end of your outstretched arm.
1
The centimetre :     This is     of a metre and is about
100
the width of your pinky nail.
1
The millimetre :     This is 10 of a centimetre and is
1000               about the width of a sewing needle.
The kilometre :       This is 1000 metres and is about the
the length of 10 football pitches.
24-Nov-11          Created by Mr. Lafferty Maths Dept.
Units of Length
Converting Measurements
Level D
×1000
kilometres
(km)
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×100
metres
(m)
×10
1000
centimetres
(cm)
100
millimetres
10                              (mm)
24-Nov-11            Created by Mr. Lafferty Maths Dept.
Units of Length
Converting Measurements
Level D

Examples
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Convert 2m to cm :              2 x 100 = 200 cm

Convert 4km to m :              4 x 1000 = 4000 m

Convert 34cm to mm : 34 x 10 = 340 mm

Convert 50cm to m :             50 ÷ 100 = 0.5 m

24-Nov-11         Created by Mr. Lafferty Maths Dept.
Units of Length
Converting Measurements
Level D
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Now try Exercise
Ch (page )

24-Nov-11          Created by Mr. Lafferty Maths Dept.
Starter Questions
Level D

1.      True or false 2.3  8 = 184
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2.          Convert to metres (m)

(a) 200 cm        (b) 550 cm                       (c) 50 cm

3.      Find 2 numbers that add to give 7
and multiply to give 10.

24-Nov-11           Created by Mr. Lafferty Maths Dept.
Perimeter
Level D

Learning Intention                                       Success Criteria
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1.      To understand the term                       1. To know the term
perimeter of a shape.
perimeter of a shape.
2. Calculate the perimeter of
a shape.

24-Nov-11                    Created by Mr. Lafferty Maths Dept.
Perimeter
Level D
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What is perimeter ?

Hint
answer is on the screen !
24-Nov-11           Created by Mr. Lafferty Maths Dept.
Perimeter
Level D
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24-Nov-11
Perimeter
Created by Mr. Lafferty Maths Dept.
Perimeter
Level D
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Perimeter
24-Nov-11    Created by Mr. Lafferty Maths Dept.
Perimeter
Level D

Perimeter
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is the distance round the
outside of a 2D shape
24-Nov-11      Created by Mr. Lafferty Maths Dept.
Perimeter
Level D

6cm                                     Calculate the
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perimeter of the
rectangle below.
3cm

Perimeter =        6 + 3 + 6 + 3 = 18cm
24-Nov-11          Created by Mr. Lafferty Maths Dept.
Perimeter
Level D

3cm
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4cm

Perimeter = 3 + 5 + 4 = 12cm
24-Nov-11          Created by Mr. Lafferty Maths Dept.
Perimeter
Level D

10cm
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Calculate the perimeter
of the rectangle.                              4cm

Perimeter = 28cm
24-Nov-11            Created by Mr. Lafferty Maths Dept.
Perimeter
Level D

Calculate the perimeter
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of the triangle below.
12cm

Perimeter = 30cm

5cm
24-Nov-11           Created by Mr. Lafferty Maths Dept.
Perimeter
Level D

Problem           Below is a drawing of the school
xm     building. Calculate the perimeter.
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4m                                  x = 12 – 9 =3 m
9m
8m
4m
Perimeter
12 m
= 12 + 8 + 3 + 4 + 9 + 4
24-Nov-11           Created by Mr. Lafferty Maths Dept.   = 40 m
Perimeter
Level D
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Now try Exercise
Ch (page )

24-Nov-11      Created by Mr. Lafferty Maths Dept.
Starter Questions
Level D

1.      True or false 2.3  100 = 2300
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2.          Convert to centimetres (cm)

(a) 29 m        (b) 5.5 m              (c) 50 mm

3.      Find 2 numbers that add to give 7
and multiply to give 12.

24-Nov-11           Created by Mr. Lafferty Maths Dept.
Area Counting Squares
Level D

Learning Intention                                       Success Criteria
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1.      To explain area in terms                     1. To understand the term
of counting squares.
area.
2. Find the area by counting
squares.

24-Nov-11                    Created by Mr. Lafferty Maths Dept.
Area Counting Squares
Level D

The area of a shape is simply defined by :
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“the amount of space a shape takes up.”

Think of a square measuring 1 cm by 1cm we say it is :
1cm

1cm                    1cm2
( 1 square centimetre )
24-Nov-11          Created by Mr. Lafferty Maths Dept.
Area Counting Squares
Level D
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Now try Exercise
Ch (page )

24-Nov-11          Created by Mr. Lafferty Maths Dept.
Starter Questions
Level D

Q1.         What is the time difference 09:28 and 11:55
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Q2.         What value is x if

x - 9 = 10

Q3.         Convert 23metres to
(a) cm     (b)    mm

24-Nov-11                Created by Mr. Lafferty Maths Dept.
Area of a Rectangle
Level D

Learning Intention                                       Success Criteria
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1.      To come up with a formula                    1. To be able to state area
for the area of a
rectangle.                                            formula for a rectangle.
2. Apply formula correctly.
(showing working)
2. Use the formula to solve
appropriate units

24-Nov-11                    Created by Mr. Lafferty Maths Dept.
Area of a Rectangle
Level D

1 cm
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B
B    L
L

L = length

L       B         A                       Area = length x
3 X 1 =           3                          breadth
4 X 3 =           12                      A= L x B
3 X 2 =           6
Must learn formula !
24-Nov-11                 Created by Mr. Lafferty Maths Dept.
Area of a Rectangle
Level D

Example

Find the area of the rectangle opposite
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B = 2cm

Area = Length x Breadth                        L = 9cm
A=LxB
A=9x2
2
A = 18 cm

24-Nov-11           Created by Mr. Lafferty Maths Dept.
Area of a Rectangle
Level D
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Now try Exercise
Ch (page )

24-Nov-11          Created by Mr. Lafferty Maths Dept.
Starter Questions
Level D

Q1.          True or false   23 5 = 5 32
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Q2.          True or false the perimeter of the shape is 130cm

13cm

10cm

Q3.          Convert 57 metres to
(a) cm      (b)   mm
24-Nov-11               Created by Mr. Lafferty Maths Dept.
Area of
A Right-Angled Triangle
Level D

Learning Intention                                     Success Criteria
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1. Use the area of a                                 1. Know area of a right-angled
rectangle formula to help                           triangle formula
us to come up with a
formula to calculate the
area of any right-angled                         2. Use formula to work out
triangle.                                           area of triangle.

3. Show all working and
units.

24-Nov-11                    Created by Mr. Lafferty Maths Dept.
Area of
Level D
A Right-Angled Triangle

Calculate the area of this shape
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A=Lxb
A = 10 x 8
8cm
A = 80cm2

10cm
24-Nov-11           Created by Mr. Lafferty Maths Dept.
Area of
Level D
A Right-Angled Triangle
1
Area=  L × B
2
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1
A=  L  B
Base                                                       2

Length
24-Nov-11          Created by Mr. Lafferty Maths Dept.
Area of
Level D
A Right-Angled Triangle
Calculate the area of this shape
1
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A=  L  B
2
12cm
1
A=  6  12
2
6cm                                   A=36cm2

24-Nov-11              Created by Mr. Lafferty Maths Dept.
Area of
Level D
A Right-Angled Triangle
Calculate the area of this shape
1
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A=  L  b
3cm
2
1
A=  4  3
4cm                                     2

A=6cm
2

24-Nov-11             Created by Mr. Lafferty Maths Dept.
Area of
Level D
A Right-Angled Triangle
www.mathsrevision.com

Now try Exercise
Ch (page )

24-Nov-11       Created by Mr. Lafferty Maths Dept.

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