Mathematics for IGCSE & O level - Similarity (Section 1 - No. 11)

What scale is a model drawn if an area of 5 m² in real life is represented by 20 cm² on the model?

1:10

1:50

1:250

1:500

Area scale factor = 5 m²/20 cm² = 50000 cm²/20 cm² = 2500. Length scale factor = sqrt(2500) = 50. Scale is 1:50