Mathematics for IGCSE & O level - Similarity (Section 1 - No. 18)
Two shapes are similar, and the ratio of their areas is 16:9. What is the ratio of their perimeters?
4:3
16:9
8:6
256:81
Giải thích
Perimeter scales with length, the scale is √Area, so √16:√9, = 4:3