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MathsAges 13-15

Area of a triangle

Calculate the area of a triangle from its base and perpendicular height using A = ½bh. Review suitability for your learners before teaching.

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Age band:Ages 10-12Ages 13-15

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Worksheet StudioPractice pack · Ages 13-15

Area of a triangle

Take your time. Show your thinking.

  1. 1. A triangle has base 18 cm and perpendicular height 14 cm. Find its area.

    18 cm · 14 cm · Area of a triangle

  2. 2. A triangle has base 6 cm and perpendicular height 8 cm. Find its area.

    6 cm · 8 cm · Area of a triangle

  3. 3. A triangle has base 10 cm and perpendicular height 8 cm. Find its area.

    10 cm · 8 cm · Area of a triangle

  4. 4. A triangle has base 6 cm and perpendicular height 11 cm. Find its area.

    6 cm · 11 cm · Area of a triangle

  5. 5. A triangle has base 24 cm and perpendicular height 4 cm. Find its area.

    24 cm · 4 cm · Area of a triangle

  6. 6. A triangle has base 20 cm and perpendicular height 5 cm. Find its area.

    20 cm · 5 cm · Area of a triangle

  7. 7. A triangle has base 6 cm and perpendicular height 15 cm. Find its area.

    6 cm · 15 cm · Area of a triangle

  8. 8. A triangle has base 10 cm and perpendicular height 5 cm. Find its area.

    10 cm · 5 cm · Area of a triangle

  9. 9. A triangle has base 30 cm and perpendicular height 16 cm. Find its area.

    30 cm · 16 cm · Area of a triangle

  10. 10. A triangle has base 10 cm and perpendicular height 4 cm. Find its area.

    10 cm · 4 cm · Area of a triangle

  11. 11. A triangle has base 20 cm and perpendicular height 16 cm. Find its area.

    20 cm · 16 cm · Area of a triangle

  12. 12. A triangle has base 32 cm and perpendicular height 11 cm. Find its area.

    32 cm · 11 cm · Area of a triangle
12 questions · Seed 64 · Age guidance, not curriculum certification
View the answer key
Worksheet StudioAnswer key · Ages 13-15

Area of a triangle

Answers and reasoning. Review before teaching.

  1. 1. A triangle has base 18 cm and perpendicular height 14 cm. Find its area.

    126 cm²

    Area = ½ × base × height = ½ × 18 × 14 = 126 cm².

  2. 2. A triangle has base 6 cm and perpendicular height 8 cm. Find its area.

    24 cm²

    Area = ½ × base × height = ½ × 6 × 8 = 24 cm².

  3. 3. A triangle has base 10 cm and perpendicular height 8 cm. Find its area.

    40 cm²

    Area = ½ × base × height = ½ × 10 × 8 = 40 cm².

  4. 4. A triangle has base 6 cm and perpendicular height 11 cm. Find its area.

    33 cm²

    Area = ½ × base × height = ½ × 6 × 11 = 33 cm².

  5. 5. A triangle has base 24 cm and perpendicular height 4 cm. Find its area.

    48 cm²

    Area = ½ × base × height = ½ × 24 × 4 = 48 cm².

  6. 6. A triangle has base 20 cm and perpendicular height 5 cm. Find its area.

    50 cm²

    Area = ½ × base × height = ½ × 20 × 5 = 50 cm².

  7. 7. A triangle has base 6 cm and perpendicular height 15 cm. Find its area.

    45 cm²

    Area = ½ × base × height = ½ × 6 × 15 = 45 cm².

  8. 8. A triangle has base 10 cm and perpendicular height 5 cm. Find its area.

    25 cm²

    Area = ½ × base × height = ½ × 10 × 5 = 25 cm².

  9. 9. A triangle has base 30 cm and perpendicular height 16 cm. Find its area.

    240 cm²

    Area = ½ × base × height = ½ × 30 × 16 = 240 cm².

  10. 10. A triangle has base 10 cm and perpendicular height 4 cm. Find its area.

    20 cm²

    Area = ½ × base × height = ½ × 10 × 4 = 20 cm².

  11. 11. A triangle has base 20 cm and perpendicular height 16 cm. Find its area.

    160 cm²

    Area = ½ × base × height = ½ × 20 × 16 = 160 cm².

  12. 12. A triangle has base 32 cm and perpendicular height 11 cm. Find its area.

    176 cm²

    Area = ½ × base × height = ½ × 32 × 11 = 176 cm².

12 questions · Seed 64 · Age guidance, not curriculum certification
Worksheet StudioPractice pack · Ages 13-15

Area of a triangle

Take your time. Show your thinking.

  1. 1. A triangle has base 18 cm and perpendicular height 14 cm. Find its area.

    18 cm · 14 cm · Area of a triangle

  2. 2. A triangle has base 6 cm and perpendicular height 8 cm. Find its area.

    6 cm · 8 cm · Area of a triangle

  3. 3. A triangle has base 10 cm and perpendicular height 8 cm. Find its area.

    10 cm · 8 cm · Area of a triangle

  4. 4. A triangle has base 6 cm and perpendicular height 11 cm. Find its area.

    6 cm · 11 cm · Area of a triangle

  5. 5. A triangle has base 24 cm and perpendicular height 4 cm. Find its area.

    24 cm · 4 cm · Area of a triangle

  6. 6. A triangle has base 20 cm and perpendicular height 5 cm. Find its area.

    20 cm · 5 cm · Area of a triangle

  7. 7. A triangle has base 6 cm and perpendicular height 15 cm. Find its area.

    6 cm · 15 cm · Area of a triangle

  8. 8. A triangle has base 10 cm and perpendicular height 5 cm. Find its area.

    10 cm · 5 cm · Area of a triangle

  9. 9. A triangle has base 30 cm and perpendicular height 16 cm. Find its area.

    30 cm · 16 cm · Area of a triangle

  10. 10. A triangle has base 10 cm and perpendicular height 4 cm. Find its area.

    10 cm · 4 cm · Area of a triangle

  11. 11. A triangle has base 20 cm and perpendicular height 16 cm. Find its area.

    20 cm · 16 cm · Area of a triangle

  12. 12. A triangle has base 32 cm and perpendicular height 11 cm. Find its area.

    32 cm · 11 cm · Area of a triangle
12 questions · Seed 64 · Age guidance, not curriculum certification
Worksheet StudioAnswer key · Ages 13-15

Area of a triangle

Answers and reasoning. Review before teaching.

  1. 1. A triangle has base 18 cm and perpendicular height 14 cm. Find its area.

    126 cm²

    Area = ½ × base × height = ½ × 18 × 14 = 126 cm².

  2. 2. A triangle has base 6 cm and perpendicular height 8 cm. Find its area.

    24 cm²

    Area = ½ × base × height = ½ × 6 × 8 = 24 cm².

  3. 3. A triangle has base 10 cm and perpendicular height 8 cm. Find its area.

    40 cm²

    Area = ½ × base × height = ½ × 10 × 8 = 40 cm².

  4. 4. A triangle has base 6 cm and perpendicular height 11 cm. Find its area.

    33 cm²

    Area = ½ × base × height = ½ × 6 × 11 = 33 cm².

  5. 5. A triangle has base 24 cm and perpendicular height 4 cm. Find its area.

    48 cm²

    Area = ½ × base × height = ½ × 24 × 4 = 48 cm².

  6. 6. A triangle has base 20 cm and perpendicular height 5 cm. Find its area.

    50 cm²

    Area = ½ × base × height = ½ × 20 × 5 = 50 cm².

  7. 7. A triangle has base 6 cm and perpendicular height 15 cm. Find its area.

    45 cm²

    Area = ½ × base × height = ½ × 6 × 15 = 45 cm².

  8. 8. A triangle has base 10 cm and perpendicular height 5 cm. Find its area.

    25 cm²

    Area = ½ × base × height = ½ × 10 × 5 = 25 cm².

  9. 9. A triangle has base 30 cm and perpendicular height 16 cm. Find its area.

    240 cm²

    Area = ½ × base × height = ½ × 30 × 16 = 240 cm².

  10. 10. A triangle has base 10 cm and perpendicular height 4 cm. Find its area.

    20 cm²

    Area = ½ × base × height = ½ × 10 × 4 = 20 cm².

  11. 11. A triangle has base 20 cm and perpendicular height 16 cm. Find its area.

    160 cm²

    Area = ½ × base × height = ½ × 20 × 16 = 160 cm².

  12. 12. A triangle has base 32 cm and perpendicular height 11 cm. Find its area.

    176 cm²

    Area = ½ × base × height = ½ × 32 × 11 = 176 cm².

12 questions · Seed 64 · Age guidance, not curriculum certification