Page 337 - Math Smart - 7

CHAPTER 15.2 In this chapter

Pupils should be able to:
• derive and use formula
Area and Perimeter for the area and
perimeter of a rectangle
• calculate the perimeter
and area of compound
Investigate! shapes made from
rectangles
• know the abbreviations
Each square represents 1 cm^. for and relationships
between square metres
(m^), square centimetres
D
(cm^) and square
B
millilitres (mm^)

^ RECALL

O Find the areas of the
following figures.
a) A figure that is
Complete the table. Rertangle A has been done as an example for you. made up of five 1-m
squares.
Rectangle A B C D E F G b) A figure that is made
up of nine 1-cm
Number of 10
squares.
squares in each
row (length of O Mr Fong wants to fence
one side, /) up his square garden.
The length of each side
Number of 4
of his garden is 2 m.
squares in each
Find the length of
column (length
fencing that he needs.
of the other
side, 6) O Mrs Steward buys a
rectangular plot of land.
length x length 40 The plot of land is
Area (cm^) 40 15 m long and 9 m wide.
What is the area of the
2 X (length + 28 plot of land?
breadth)
O the perimeter
Perimeter (cm) 28 and area of the figure.
(All lines meet at right
Is the shape a rectangle
angles.)
rectangle or a 14 cm
1 square?
3 cm

Formula for the Formula for the
7 cm
area of rectangle: perimeter of rectangle:

4 cm 4 cm