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Area of a triangle cut from a rectangle

Grade 6 math · 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/practice/grade-6/area-of-half-a-rectangle/

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

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  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: 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