Mathematics for IGCSE & O level - Similarity (Section 2 - No. 33)
If two rectangles are similar, and the scale factor of the sides is 3, how does the area change?
Remains the same
Increases by a factor of 3
Increases by a factor of 6
Increases by a factor of 9
Forklaring
Area scale factor = (length scale factor)^2, so 3^2 = 9.