Cambridge International Mathematics

12 m

13 m

5m

7m

5m

11 m

6m

9.7 cm

5.7 cm

3.2 cm

4.3 km

3.8 km

2.9 cm

2.2 m

8.3 km

3.4 m

4.1 m

b

a

k

l

m

4 a

3 a

Mensuration (length and area) (Chapter 9) 195

EXERCISE 9B

1 Measure with your ruler the lengths of the sides of each given figure and then find its perimeter.

abc

2 Find the perimeter of:

abc

de f

gh i

3 Find a formula for the perimeterPof:

abc

4 An isosceles triangle has a perimeter of 30 cm. If the base is 7 : 8 cm long, find the length of the equal

sides.

5 A rectangle has one side of length 11 : 2 m and its perimeter is 39 : 8 m. Find the width of the rectangle.

6 A rectangle is 16 : 4 cm by 11 : 8 cm and has the same perimeter as an equilateral triangle. Find the

length of the sides of the triangle.

IGCSE01

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Y:\HAESE\IGCSE01\IG01_09\195IGCSE01_09.CDR Thursday, 2 October 2008 11:44:06 AM PETER