Mathematics for IGCSE & O level - Similarity (Section 1 - No. 19)
A model of a car is made to a scale of 1:20. If the surface area of the real car is 10 m², what is the surface area of the model?
0.025 m²
0.0025 m²
200 m²
0.5 m²
解释
The scale factor is 20, so the area scale factor is 20² = 400. The area of the model is 10/400 = 0.025 m²