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Geometry · Grades 5 to 7

Area of a triangle worksheet generator

Make area of a triangle worksheets with right, acute and obtuse triangles, each with its base and height labeled. Choose centimeters, inches, meters, feet or a mix.

Area of trianglesLetter 8.5 × 11 in · answer key on the last page
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In the print window choose Letter and 100% scale, or Save as PDF.

Area of triangles
NameDate

Find the area of each triangle. Area = ½ × base × height.

  1. 1.
    10 cm9 cm
    Area =
  2. 2.
    10 m13 m
    Area =
  3. 3.
    6 ft4 ft
    Area =
  4. 4.
    6 in10 in
    Area =
  5. 5.
    5 ft2 ft
    Area =
  6. 6.
    11 cm10 cm
    Area =
  7. 7.
    8 cm3 cm
    Area =
  8. 8.
    12 m2 m
    Area =
  9. 9.
    9 ft14 ft
    Area =
nation1.netSheet 140030307
Area of triangles
Answer key
  1. 1.½ × 10 × 945 cm²
  2. 2.½ × 10 × 1365 m²
  3. 3.½ × 6 × 412 ft²
  4. 4.½ × 6 × 1030 in²
  5. 5.½ × 5 × 25 ft²
  6. 6.½ × 11 × 1055 cm²
  7. 7.½ × 8 × 312 cm²
  8. 8.½ × 12 × 212 m²
  9. 9.½ × 9 × 1463 ft²
nation1.netSheet 140030307 · answers
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About this worksheet

Area of a triangle is half of base times height: A = ½ × b × h. The height is always measured at a right angle to the base, which for an obtuse triangle sits outside the shape.

Teaching tip

Show one triangle as half of a rectangle with the same base and height. Students who see it remember the ½.

How to use the generator

Change the settings and the sheet updates as you go. New worksheet gives a fresh set of problems with a new answer key. Print or save PDF opens your browser's print window: pick Letter paper and 100% scale, or Save as PDF to keep a copy.