Scales and Diagram

Question

When making a photocopy of a 10 cm by 15 cm photograph, Elizabeth enlarged the picture by a scale factor of 150%. By what percent was the area of the photograph enlarged?

Answer 1

The scale factor is 3/2 (3/2 = 150%)

In similar figures the ratio of the areas is as the square of the scale factor.

The larger photo's area is 9/4, 225%, of the small photo.