Mathematics for IGCSE & O level - Similarity (Section 2 - No. 5)
A cube has a surface area of 54 cm². If each side is doubled, what is the new surface area?
108 cm²
162 cm²
216 cm²
432 cm²
Explanation
Scaling by 2 means the area is scaled by 2² = 4 times larger. Thus 4* 54= 216cm²