This is a comprehensive pack of notes about grade 9 area and perimeter. It teaches about perimeter, area of triangles, circles. It contains notes, examples and particularly exercises with answers.
EXercise 1 - Identifvina 2D shapes and 3D objectS
a) Name the following shapes / objects:
Ircspeziwn Rawcleoqian Rekesde
2hentaus Kite
Cabe aboid is
rcclarguw ism
b) Name the following triangles according to the size of their angles and the lengthof
their sides, e.g. obtuse angled scalene triangle.
, Perimeter
Tne perimeter of any closed
two-dimensionalshape is the total distance arourid ui
Outside of the shape. The perimeter of a circle is called its
circumference.
Perimeter is expressed in linear units such as
mm, cm, m or Km.
Note:
1 km = 1000 m
1m= 100 cm=1000 mm
1 cm = 10 mm
Summary of formulae for perimeter learnt in grade 8:
Description Perimeter (P)
Shape
S
P=s t s+ s +s
= 4s
Square
P=l+b+l+ b
Rectangle =2l + 2b
= 2(l + b)
Triangle P=a t b +c
C= 2rr
Circle
(The perimeter of acircle or
is called the circumference)
C= Id
Since d= 2r
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