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MathsAges 13-15

Circle circumference & area

Use π ≈ 3.14 and radius r to calculate the circumference or area of a circle. Review suitability for your learners before teaching.

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Age band:Ages 13-15Ages 16-18

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Worksheet StudioPractice pack · Ages 13-15

Circle circumference & area

Take your time. Show your thinking.

  1. 1. A circle has radius 20 cm. Using π = 3.14, find its circumference.

    20 cm · 3.14 · Circle circumference & area

  2. 2. A circle has radius 7 cm. Using π = 3.14, find its circumference.

    7 cm · 3.14 · Circle circumference & area

  3. 3. A circle has radius 19 cm. Using π = 3.14, find its circumference.

    19 cm · 3.14 · Circle circumference & area

  4. 4. A circle has radius 4 cm. Using π = 3.14, find its circumference.

    4 cm · 3.14 · Circle circumference & area

  5. 5. A circle has radius 2 cm. Using π = 3.14, find its circumference.

    2 cm · 3.14 · Circle circumference & area

  6. 6. A circle has radius 8 cm. Using π = 3.14, find its area.

    8 cm · 3.14 · Circle circumference & area

  7. 7. A circle has radius 13 cm. Using π = 3.14, find its circumference.

    13 cm · 3.14 · Circle circumference & area

  8. 8. A circle has radius 5 cm. Using π = 3.14, find its circumference.

    5 cm · 3.14 · Circle circumference & area

  9. 9. A circle has radius 3 cm. Using π = 3.14, find its area.

    3 cm · 3.14 · Circle circumference & area

  10. 10. A circle has radius 3 cm. Using π = 3.14, find its circumference.

    3 cm · 3.14 · Circle circumference & area

  11. 11. A circle has radius 11 cm. Using π = 3.14, find its area.

    11 cm · 3.14 · Circle circumference & area

  12. 12. A circle has radius 11 cm. Using π = 3.14, find its circumference.

    11 cm · 3.14 · Circle circumference & area
12 questions · Seed 62 · Age guidance, not curriculum certification
View the answer key
Worksheet StudioAnswer key · Ages 13-15

Circle circumference & area

Answers and reasoning. Review before teaching.

  1. 1. A circle has radius 20 cm. Using π = 3.14, find its circumference.

    125.6 cm

    Circumference C = 2πr = 2 × 3.14 × 20 = 125.6 cm.

  2. 2. A circle has radius 7 cm. Using π = 3.14, find its circumference.

    43.96 cm

    Circumference C = 2πr = 2 × 3.14 × 7 = 43.96 cm.

  3. 3. A circle has radius 19 cm. Using π = 3.14, find its circumference.

    119.32 cm

    Circumference C = 2πr = 2 × 3.14 × 19 = 119.32 cm.

  4. 4. A circle has radius 4 cm. Using π = 3.14, find its circumference.

    25.12 cm

    Circumference C = 2πr = 2 × 3.14 × 4 = 25.12 cm.

  5. 5. A circle has radius 2 cm. Using π = 3.14, find its circumference.

    12.56 cm

    Circumference C = 2πr = 2 × 3.14 × 2 = 12.56 cm.

  6. 6. A circle has radius 8 cm. Using π = 3.14, find its area.

    200.96 cm²

    Area A = πr² = 3.14 × 8² = 200.96 cm².

  7. 7. A circle has radius 13 cm. Using π = 3.14, find its circumference.

    81.64 cm

    Circumference C = 2πr = 2 × 3.14 × 13 = 81.64 cm.

  8. 8. A circle has radius 5 cm. Using π = 3.14, find its circumference.

    31.4 cm

    Circumference C = 2πr = 2 × 3.14 × 5 = 31.4 cm.

  9. 9. A circle has radius 3 cm. Using π = 3.14, find its area.

    28.26 cm²

    Area A = πr² = 3.14 × 3² = 28.26 cm².

  10. 10. A circle has radius 3 cm. Using π = 3.14, find its circumference.

    18.84 cm

    Circumference C = 2πr = 2 × 3.14 × 3 = 18.84 cm.

  11. 11. A circle has radius 11 cm. Using π = 3.14, find its area.

    379.94 cm²

    Area A = πr² = 3.14 × 11² = 379.94 cm².

  12. 12. A circle has radius 11 cm. Using π = 3.14, find its circumference.

    69.08 cm

    Circumference C = 2πr = 2 × 3.14 × 11 = 69.08 cm.

12 questions · Seed 62 · Age guidance, not curriculum certification
Worksheet StudioPractice pack · Ages 13-15

Circle circumference & area

Take your time. Show your thinking.

  1. 1. A circle has radius 20 cm. Using π = 3.14, find its circumference.

    20 cm · 3.14 · Circle circumference & area

  2. 2. A circle has radius 7 cm. Using π = 3.14, find its circumference.

    7 cm · 3.14 · Circle circumference & area

  3. 3. A circle has radius 19 cm. Using π = 3.14, find its circumference.

    19 cm · 3.14 · Circle circumference & area

  4. 4. A circle has radius 4 cm. Using π = 3.14, find its circumference.

    4 cm · 3.14 · Circle circumference & area

  5. 5. A circle has radius 2 cm. Using π = 3.14, find its circumference.

    2 cm · 3.14 · Circle circumference & area

  6. 6. A circle has radius 8 cm. Using π = 3.14, find its area.

    8 cm · 3.14 · Circle circumference & area

  7. 7. A circle has radius 13 cm. Using π = 3.14, find its circumference.

    13 cm · 3.14 · Circle circumference & area

  8. 8. A circle has radius 5 cm. Using π = 3.14, find its circumference.

    5 cm · 3.14 · Circle circumference & area

  9. 9. A circle has radius 3 cm. Using π = 3.14, find its area.

    3 cm · 3.14 · Circle circumference & area

  10. 10. A circle has radius 3 cm. Using π = 3.14, find its circumference.

    3 cm · 3.14 · Circle circumference & area

  11. 11. A circle has radius 11 cm. Using π = 3.14, find its area.

    11 cm · 3.14 · Circle circumference & area

  12. 12. A circle has radius 11 cm. Using π = 3.14, find its circumference.

    11 cm · 3.14 · Circle circumference & area
12 questions · Seed 62 · Age guidance, not curriculum certification
Worksheet StudioAnswer key · Ages 13-15

Circle circumference & area

Answers and reasoning. Review before teaching.

  1. 1. A circle has radius 20 cm. Using π = 3.14, find its circumference.

    125.6 cm

    Circumference C = 2πr = 2 × 3.14 × 20 = 125.6 cm.

  2. 2. A circle has radius 7 cm. Using π = 3.14, find its circumference.

    43.96 cm

    Circumference C = 2πr = 2 × 3.14 × 7 = 43.96 cm.

  3. 3. A circle has radius 19 cm. Using π = 3.14, find its circumference.

    119.32 cm

    Circumference C = 2πr = 2 × 3.14 × 19 = 119.32 cm.

  4. 4. A circle has radius 4 cm. Using π = 3.14, find its circumference.

    25.12 cm

    Circumference C = 2πr = 2 × 3.14 × 4 = 25.12 cm.

  5. 5. A circle has radius 2 cm. Using π = 3.14, find its circumference.

    12.56 cm

    Circumference C = 2πr = 2 × 3.14 × 2 = 12.56 cm.

  6. 6. A circle has radius 8 cm. Using π = 3.14, find its area.

    200.96 cm²

    Area A = πr² = 3.14 × 8² = 200.96 cm².

  7. 7. A circle has radius 13 cm. Using π = 3.14, find its circumference.

    81.64 cm

    Circumference C = 2πr = 2 × 3.14 × 13 = 81.64 cm.

  8. 8. A circle has radius 5 cm. Using π = 3.14, find its circumference.

    31.4 cm

    Circumference C = 2πr = 2 × 3.14 × 5 = 31.4 cm.

  9. 9. A circle has radius 3 cm. Using π = 3.14, find its area.

    28.26 cm²

    Area A = πr² = 3.14 × 3² = 28.26 cm².

  10. 10. A circle has radius 3 cm. Using π = 3.14, find its circumference.

    18.84 cm

    Circumference C = 2πr = 2 × 3.14 × 3 = 18.84 cm.

  11. 11. A circle has radius 11 cm. Using π = 3.14, find its area.

    379.94 cm²

    Area A = πr² = 3.14 × 11² = 379.94 cm².

  12. 12. A circle has radius 11 cm. Using π = 3.14, find its circumference.

    69.08 cm

    Circumference C = 2πr = 2 × 3.14 × 11 = 69.08 cm.

12 questions · Seed 62 · Age guidance, not curriculum certification