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Diagonals of rectangles: round to the nearest tenth

Grade 8 math · Fieldbook Learning

Name ______________________ Date __________

Draw the right triangle, decide which side is the hypotenuse, and use the Pythagorean theorem.

  1. A rectangular screen is 18 cm wide and 8 cm tall. How long is its diagonal, in cm? Round to the nearest tenth.
  2. A rectangular window is 16 cm wide and 17 cm tall. How long is its diagonal, in cm? Round to the nearest tenth.
  3. A rectangular window is 10 cm wide and 9 cm tall. How long is its diagonal, in cm? Round to the nearest tenth.
  4. A rectangular tablet is 19 cm wide and 14 cm tall. How long is its diagonal, in cm? Round to the nearest tenth.
  5. A rectangular tablet is 12 cm wide and 25 cm tall. How long is its diagonal, in cm? Round to the nearest tenth.
  6. A rectangular picture frame is 16 cm wide and 24 cm tall. How long is its diagonal, in cm? Round to the nearest tenth.
  7. A rectangular screen is 10 cm wide and 11 cm tall. How long is its diagonal, in cm? Round to the nearest tenth.
  8. A rectangular picture frame is 6 cm wide and 3 cm tall. How long is its diagonal, in cm? Round to the nearest tenth.
  9. A rectangular picture frame is 30 cm wide and 14 cm tall. How long is its diagonal, in cm? Round to the nearest tenth.
  10. A rectangular screen is 17 cm wide and 8 cm tall. How long is its diagonal, in cm? Round to the nearest tenth.
  11. A rectangular screen is 22 cm wide and 22 cm tall. How long is its diagonal, in cm? Round to the nearest tenth.
  12. A rectangular picture frame is 8 cm wide and 4 cm tall. How long is its diagonal, in cm? Round to the nearest tenth.
  13. A rectangular screen is 37 cm wide and 9 cm tall. How long is its diagonal, in cm? Round to the nearest tenth.
  14. A rectangular picture frame is 33 cm wide and 7 cm tall. How long is its diagonal, in cm? Round to the nearest tenth.
  15. A rectangular picture frame is 34 cm wide and 27 cm tall. How long is its diagonal, in cm? Round to the nearest tenth.
  16. A rectangular screen is 13 cm wide and 12 cm tall. How long is its diagonal, in cm? Round to the nearest tenth.
  17. A rectangular tablet is 42 cm wide and 6 cm tall. How long is its diagonal, in cm? Round to the nearest tenth.
  18. A rectangular window is 18 cm wide and 5 cm tall. How long is its diagonal, in cm? Round to the nearest tenth.
  19. A rectangular picture frame is 14 cm wide and 15 cm tall. How long is its diagonal, in cm? Round to the nearest tenth.
  20. A rectangular window is 19 cm wide and 39 cm tall. How long is its diagonal, in cm? Round to the nearest tenth.
More free practice: fieldbooklearning.com/ca/practice/grade-8/diagonals-of-rectangles-round-to-the-nearest-tenth/

Play it as a quiz game

20 of these questions as multiple choice, with near-miss wrong answers, ready for Kahoot or Blooket.

  1. Download the game's own question template: in Kahoot, Add question → Import spreadsheet; in Blooket, Create a set → Spreadsheet import.
  2. Click the matching button below, then click the first empty question row of the template and paste.
  3. Save the template (Kahoot needs .xlsx, Blooket .csv) and upload it.
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Answer key: Diagonals of rectangles: round to the nearest tenth

  1. 19.7
  2. 23.3
  3. 13.5
  4. 23.6
  5. 27.7
  6. 28.8
  7. 14.9
  8. 6.7
  9. 33.1
  10. 18.8
  11. 31.1
  12. 8.9
  13. 38.1
  14. 33.7
  15. 43.4
  16. 17.7
  17. 42.4
  18. 18.7
  19. 20.5
  20. 43.4