Mathematics for IGCSE & O level - Similarity (Section 1 - No. 45)
What happens to the area of a square if you increase the length of its sides by 100%?
The area doubles.
The area triples.
The area quadruples.
The area remains the same.
Forklaring
Increasing the sides by 100% means you're doubling the side length. Therefore, the area becomes 2^2 or four times as large.