Mathematics for IGCSE & O level - Similarity (Section 2 - No. 30)
If a model drawn an area of 5m² in real life is represented by 20 cm² on the model, what is the scale?
1:5
1:25
1:50
1:100
Explicació
5 m² is equivalent to 50,000 cm². Scale factor is the square root of (50000/20) = 50, hence the scale is 1:50.