Estimated difficulty: Medium

The rectangle has area 80 cm². The shaded triangle uses the whole bottom side as its base, and its third vertex lies on the top side. Find the shaded area.

The rectangle has area 80 cm². The shaded triangle uses the whole bottom side as its base, and its third vertex lies on the top side. Find the shaded area.
Use π, fractions, or sqrt(2). Decimals to two places are fine.

Enter the correct answer to unlock Puzzle 2.

All puzzles
  1. Puzzle 1 · Medium (estimated)
  2. Puzzle 2 · Medium (estimated) · Locked
  3. Puzzle 3 · Hard (estimated) · Locked
  4. Puzzle 4 · Medium (estimated) · Locked
  5. Puzzle 5 · Hard (estimated) · Locked
  6. Puzzle 6 · Hard (estimated) · Locked
  7. Puzzle 7 · Hard (estimated) · Locked
  8. Puzzle 8 · Hard (estimated) · Locked
  9. Puzzle 9 · Hard (estimated) · Locked
  10. Puzzle 10 · Hard (estimated) · Locked
  11. Puzzle 11 · Hard (estimated) · Locked
  12. Puzzle 12 · Hard (estimated) · Locked
  13. Puzzle 13 · Hard (estimated) · Locked
  14. Puzzle 14 · Hard (estimated) · Locked