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