Create a free account now and get 3 full lessons, completely free. Get my 3 free lessons

Australia
Practise online insteadThe answer key prints on page 2.

Area of a triangle cut from a rectangle

Year 6 maths · Fieldbook Learning

Name ______________________ Date __________

A diagonal cuts a rectangle into two equal triangles.

  1. A rectangle 12 cm by 7 cm is cut along a diagonal into two right triangles. What is the area of one triangle?
  2. A rectangle 2 cm by 9 cm is cut along a diagonal into two right triangles. What is the area of one triangle?
  3. A rectangle 4 cm by 9 cm is cut along a diagonal into two right triangles. What is the area of one triangle?
  4. A rectangle 6 cm by 8 cm is cut along a diagonal into two right triangles. What is the area of one triangle?
  5. A rectangle 12 cm by 12 cm is cut along a diagonal into two right triangles. What is the area of one triangle?
  6. A rectangle 6 cm by 11 cm is cut along a diagonal into two right triangles. What is the area of one triangle?
  7. A rectangle 16 cm by 15 cm is cut along a diagonal into two right triangles. What is the area of one triangle?
  8. A rectangle 6 cm by 6 cm is cut along a diagonal into two right triangles. What is the area of one triangle?
  9. A rectangle 16 cm by 24 cm is cut along a diagonal into two right triangles. What is the area of one triangle?
  10. A rectangle 24 cm by 18 cm is cut along a diagonal into two right triangles. What is the area of one triangle?
  11. A rectangle 24 cm by 3 cm is cut along a diagonal into two right triangles. What is the area of one triangle?
  12. A rectangle 16 cm by 6 cm is cut along a diagonal into two right triangles. What is the area of one triangle?
  13. A rectangle 28 m by 19 m is cut along a diagonal into two right triangles. What is the area of one triangle?
  14. A rectangle 30 m by 12 m is cut along a diagonal into two right triangles. What is the area of one triangle?
  15. A rectangle 36 m by 40 m is cut along a diagonal into two right triangles. What is the area of one triangle?
  16. A rectangle 38 m by 21 m is cut along a diagonal into two right triangles. What is the area of one triangle?
  17. A rectangle 22 m by 29 m is cut along a diagonal into two right triangles. What is the area of one triangle?
  18. A rectangle 18 m by 68 m is cut along a diagonal into two right triangles. What is the area of one triangle?
  19. A rectangle 40 m by 76 m is cut along a diagonal into two right triangles. What is the area of one triangle?
  20. A rectangle 10 m by 98 m is cut along a diagonal into two right triangles. What is the area of one triangle?
More free practice: fieldbooklearning.com/au/practice/year-6/area-of-half-a-rectangle/

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.
Download CSV

Answer key: Area of a triangle cut from a rectangle

  1. 42 cm²
  2. 9 cm²
  3. 18 cm²
  4. 24 cm²
  5. 72 cm²
  6. 33 cm²
  7. 120 cm²
  8. 18 cm²
  9. 192 cm²
  10. 216 cm²
  11. 36 cm²
  12. 48 cm²
  13. 266 m²
  14. 180 m²
  15. 720 m²
  16. 399 m²
  17. 319 m²
  18. 612 m²
  19. 1520 m²
  20. 490 m²