wikiHow Calculating the Diagonal of a Square Practice Problems Note: To solve these problems, use the formula d = s√2, where d is the diagonal and s is the length of one side of the square. Round your answers to the nearest hundredth, if necessary. 1. Find the diagonal of a square with side length 5 cm. 2. Find the diagonal of a square with side length 12 in. 3. Find the diagonal of a square with side length 8 mm. 4. Find the diagonal of a square with side length 9 ft. 5. Find the diagonal of a square with side length 6 cm. 6. Find the diagonal of a square with side length 15 in. 7. Find the diagonal of a square with side length 7 mm. 8. Find the diagonal of a square with side length 10 ft. 9. Find the diagonal of a square with side length 3 cm. 10. Find the diagonal of a square with side length 20 in. 11. Find the diagonal of a square with side length 4 mm. 12. Find the diagonal of a square with side length 11 ft. 13. Find the diagonal of a square with side length 6.5 cm. 14. Find the diagonal of a square with side length 14 in. 15. Find the diagonal of a square with side length 9 mm. 16. Find the diagonal of a square with side length 7.5 ft. 17. Find the diagonal of a square with side length 2 cm. 18. Find the diagonal of a square with side length 18 in. 19. Find the diagonal of a square with side length 5.5 mm. 20. Find the diagonal of a square with side length 12.5 ft. Page