Transcript No Slide Title

This presentation is based on
KEY MATHS 7 (1)
Press the LEFT mouse
button to move on
Section 12
Area & Perimeter
Perimeter
The total distance around the outside of a
shape is called its perimeter
A PERIMETER
FENCE
Section 12
Area & Perimeter
Area
The amount of space inside the shape is called
its area
AREA OF
GRASS
Section 12
Area & Perimeter
Example 1
What is the perimeter of this shape?
Pick a starting point
Then work
your way
around
1
1
2
2
Click
Ansagain
=
for the
40
answer
2
2
6
2
Section 12
Area & Perimeter
Example 2
What is the area of this room?
2
You could
count the
squares
Click
Ansagain
=
for the 2
38cm
answer
2
5
4
Section 12
Area
Area of a rectangle =
length x width =
10 x 5
5cm
Click
Ansagain
=
for the 2
50cm
answer
10cm
Section 12
Area
Area of a triangle =
base x height =
2
h
bxh
2
b
Section 12
Area
Area of a triangle =
base x height =
2
h
bxh
2
b
Section 12
Area
Area of a triangle =
base x height =
2
4x8
2
Click
Ansagain
=
for the 2
16cm
answer
8cm
4cm
Section 12
Area
Area of a parallelogram =
base x height =
bxh
h
b
Section 12
Area
Area of a parallelogram =
base x height =
5x6
6cm
Click
Ansagain
=
for the 2
30cm
answer
5cm
Section 12
Area
Area of a
a
trapezium
= a+b xh
2
h
b
Section 12
Area
Area of a trapezium
= 5+9 x6
2
5
6
Click
Ansagain
=
for the 2
42cm
answer
9
Area of a kite (or rhombus)
= the product of the diagonals
2
Click
Ansagain
=
for the 2
12cm
answer
= 3x8
2
8cm
3 cm
Well done you have completed this presentation
Why not try some of the other lessons
Steve Hill