Question

Express the following statement as RF scale
i)0.5cm to represent 2 metres
ii)2cm to represent 4 kilometre
iii)2 inches to represent 1 milie

Answer 1

i) 1:400
ii) 1:200,000
iii) 1:63,360

Answer 2

Express the following RF scale in cms to kms
i)1:1000000
ii)1:77777
iii)1:133333
iv)1:9000
v)1:6000000

Answer 3

i) 1 cm represents 10 kms
ii) 1 cm represents 777.77 m (or 0.77777 km)
iii) 1 cm represents 1.33333 kms
iv) 1 cm represents 90 m (or 0.09 km)
v) 1 cm represents 60 kms

Answer 4

0.5 cm = 0.005 m
so
0.005 m / 2 m = 1 m / x m
x = 2 / .005 = 400
so
1/400
========
2 cm = 0.02 m
4 km = 4,000 m
0.02 / 4000 = 1/x
x = 4000/0.02 = 200,000
so
1/200,000
etc

Answer 5

These calculations are correct and result in the correct RF scale for each scenario.