Solve Puzzle 1 to unlock this puzzle.
Estimated difficulty: Hard
ABCD is a square. Points E, F, G and H lie on AB, BC, CD and DA, respectively, with AE:EB = BF:FC = CG:GD = DH:HA = 1:3. The inner square EFGH has area 160 cm². Find the total shaded area of the four corners.
Enter the correct answer to unlock Puzzle 9.
All puzzles
- Puzzle 1 · Medium (estimated)
- Puzzle 2 · Medium (estimated) · Locked
- Puzzle 3 · Hard (estimated) · Locked
- Puzzle 4 · Medium (estimated) · Locked
- Puzzle 5 · Hard (estimated) · Locked
- Puzzle 6 · Hard (estimated) · Locked
- Puzzle 7 · Hard (estimated) · Locked
- Puzzle 8 · Hard (estimated) · Locked
- Puzzle 9 · Hard (estimated) · Locked
- Puzzle 10 · Hard (estimated) · Locked
- Puzzle 11 · Hard (estimated) · Locked
- Puzzle 12 · Hard (estimated) · Locked
- Puzzle 13 · Hard (estimated) · Locked
- Puzzle 14 · Hard (estimated) · Locked