Scale drawings and maps
1 : n
A scale of 1 : 50,000 means 1 cm on the map is 50,000 cm in real life, which is 500 m.
- 4.2 cm on a 1 : 50,000 map
- 4.2 × 50,000 = 210,000 cm
- = 2,100 m = 2.1 km
Going the other way, divide: 3 km = 300,000 cm, and ÷ 50,000 gives 6 cm on the map.
Areas on a plan
Scale the lengths first, then work out the area.
On a 1 : 100 plan, a 3 cm by 4 cm room is 3 m by 4 m, so 12 m². Multiplying 12 cm² by 100 would be wrong: areas scale by 100².
Loading the question
This question is in Brainlag Plus