Question

Q
18. (a) The scale of a map is 1:20000000
On the map, the distance between Cairo and Addis Ababa is 12 cm.
i) Calculate the distance, in kilometres, between Cairo and Addis Ababa.
[2]
Help please ​

Answer 1

Answer:

2400 km

Step-by-step explanation:

12/100×1/1000 ×20000000

= 2400 km

Answer 2

Answer:

One unit of length on the plan represents some number of same units of length on the ground,such as 1/1000,etc.

This Ratio of map distance to the corresponding ground distance is independent of units of measurement and is called representative fraction (R.F.).

The representative fraction can be very easily found for a given engineer’s scale.

If the scale is

R.F.= 1/2000000

=1/2x 10000x100

1cm=20000m

The scale of a map is given as= 1/2000000

Two town are 4 cm apart on the map.

the actual distance between two towns

=4x 20000

=80000 m

=80000/1000 Km

=80Km

Ans

I hope it's help you!