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Find a missing side: round to the nearest tenth

Year 8 maths · Fieldbook Learning

Name ______________________ Date __________

Use a² + b² = c² and solve for the missing leg: subtract the known leg squared from the hypotenuse squared.

  1. A right triangle has a hypotenuse of 18 cm and one leg of 13 cm. How long is the other leg, in cm? Round to the nearest tenth.
  2. A right triangle has legs of 9 m and 9 m. How long is the hypotenuse, in m? Round to the nearest tenth.
  3. A right triangle has legs of 7 cm and 5 cm. How long is the hypotenuse, in cm? Round to the nearest tenth.
  4. A right triangle has a hypotenuse of 16 m and one leg of 7 m. How long is the other leg, in m? Round to the nearest tenth.
  5. A right triangle has a hypotenuse of 8 cm and one leg of 6 cm. How long is the other leg, in cm? Round to the nearest tenth.
  6. A right triangle has legs of 10 cm and 7 cm. How long is the hypotenuse, in cm? Round to the nearest tenth.
  7. A right triangle has a hypotenuse of 19 km and one leg of 10 km. How long is the other leg, in km? Round to the nearest tenth.
  8. A right triangle has a hypotenuse of 14 cm and one leg of 13 cm. How long is the other leg, in cm? Round to the nearest tenth.
  9. A right triangle has a hypotenuse of 26 km and one leg of 23 km. How long is the other leg, in km? Round to the nearest tenth.
  10. A right triangle has a hypotenuse of 14 m and one leg of 8 m. How long is the other leg, in m? Round to the nearest tenth.
  11. A right triangle has a hypotenuse of 28 m and one leg of 16 m. How long is the other leg, in m? Round to the nearest tenth.
  12. A right triangle has a hypotenuse of 11 cm and one leg of 10 cm. How long is the other leg, in cm? Round to the nearest tenth.
  13. A right triangle has legs of 25 cm and 6 cm. How long is the hypotenuse, in cm? Round to the nearest tenth.
  14. A right triangle has a hypotenuse of 13 km and one leg of 6 km. How long is the other leg, in km? Round to the nearest tenth.
  15. A right triangle has legs of 18 m and 9 m. How long is the hypotenuse, in m? Round to the nearest tenth.
  16. A right triangle has legs of 6 m and 3 m. How long is the hypotenuse, in m? Round to the nearest tenth.
  17. A right triangle has legs of 6 m and 27 m. How long is the hypotenuse, in m? Round to the nearest tenth.
  18. A right triangle has a hypotenuse of 38 cm and one leg of 9 cm. How long is the other leg, in cm? Round to the nearest tenth.
  19. A right triangle has legs of 13 m and 4 m. How long is the hypotenuse, in m? Round to the nearest tenth.
  20. A right triangle has a hypotenuse of 6 km and one leg of 3 km. How long is the other leg, in km? Round to the nearest tenth.
More free practice: fieldbooklearning.com/au/practice/year-8/find-a-missing-side-round-to-the-nearest-tenth/

Play it as a quiz game

8 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.
Download CSV

Answer key: Find a missing side: round to the nearest tenth

  1. 12.4
  2. 12.7
  3. 8.6
  4. 14.4
  5. 5.3
  6. 12.2
  7. 16.2
  8. 5.2
  9. 12.1
  10. 11.5
  11. 23
  12. 4.6
  13. 25.7
  14. 11.5
  15. 20.1
  16. 6.7
  17. 27.7
  18. 36.9
  19. 13.6
  20. 5.2