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MathsAges 16-18

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 16-18

Circle circumference & area

Take your time. Show your thinking.

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

    4 cm · 3.14 · Circle circumference & area

  2. 2. A circle has radius 15 cm. Using π = 3.14, find its circumference.

    15 cm · 3.14 · Circle circumference & area

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

    8 cm · 3.14 · Circle circumference & area

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

    5 cm · 3.14 · Circle circumference & area

  5. 5. A circle has radius 13 cm. Using π = 3.14, find its area.

    13 cm · 3.14 · Circle circumference & area

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

    19 cm · 3.14 · Circle circumference & area

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

    11 cm · 3.14 · Circle circumference & area

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

    6 cm · 3.14 · Circle circumference & area

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

    12 cm · 3.14 · Circle circumference & area

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

    3 cm · 3.14 · Circle circumference & area

  11. 11. A circle has radius 16 cm. Using π = 3.14, find its circumference.

    16 cm · 3.14 · Circle circumference & area

  12. 12. A circle has radius 7 cm. Using π = 3.14, find its area.

    7 cm · 3.14 · Circle circumference & area
12 questions · Seed 44 · Age guidance, not curriculum certification
View the answer key
Worksheet StudioAnswer key · Ages 16-18

Circle circumference & area

Answers and reasoning. Review before teaching.

  1. 1. 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.

  2. 2. A circle has radius 15 cm. Using π = 3.14, find its circumference.

    94.2 cm

    Circumference C = 2πr = 2 × 3.14 × 15 = 94.2 cm.

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

    50.24 cm

    Circumference C = 2πr = 2 × 3.14 × 8 = 50.24 cm.

  4. 4. 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.

  5. 5. A circle has radius 13 cm. Using π = 3.14, find its area.

    530.66 cm²

    Area A = πr² = 3.14 × 13² = 530.66 cm².

  6. 6. 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.

  7. 7. 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.

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

    37.68 cm

    Circumference C = 2πr = 2 × 3.14 × 6 = 37.68 cm.

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

    75.36 cm

    Circumference C = 2πr = 2 × 3.14 × 12 = 75.36 cm.

  10. 10. 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.

  11. 11. A circle has radius 16 cm. Using π = 3.14, find its circumference.

    100.48 cm

    Circumference C = 2πr = 2 × 3.14 × 16 = 100.48 cm.

  12. 12. A circle has radius 7 cm. Using π = 3.14, find its area.

    153.86 cm²

    Area A = πr² = 3.14 × 7² = 153.86 cm².

12 questions · Seed 44 · Age guidance, not curriculum certification
Worksheet StudioPractice pack · Ages 16-18

Circle circumference & area

Take your time. Show your thinking.

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

    4 cm · 3.14 · Circle circumference & area

  2. 2. A circle has radius 15 cm. Using π = 3.14, find its circumference.

    15 cm · 3.14 · Circle circumference & area

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

    8 cm · 3.14 · Circle circumference & area

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

    5 cm · 3.14 · Circle circumference & area

  5. 5. A circle has radius 13 cm. Using π = 3.14, find its area.

    13 cm · 3.14 · Circle circumference & area

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

    19 cm · 3.14 · Circle circumference & area

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

    11 cm · 3.14 · Circle circumference & area

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

    6 cm · 3.14 · Circle circumference & area

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

    12 cm · 3.14 · Circle circumference & area

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

    3 cm · 3.14 · Circle circumference & area

  11. 11. A circle has radius 16 cm. Using π = 3.14, find its circumference.

    16 cm · 3.14 · Circle circumference & area

  12. 12. A circle has radius 7 cm. Using π = 3.14, find its area.

    7 cm · 3.14 · Circle circumference & area
12 questions · Seed 44 · Age guidance, not curriculum certification
Worksheet StudioAnswer key · Ages 16-18

Circle circumference & area

Answers and reasoning. Review before teaching.

  1. 1. 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.

  2. 2. A circle has radius 15 cm. Using π = 3.14, find its circumference.

    94.2 cm

    Circumference C = 2πr = 2 × 3.14 × 15 = 94.2 cm.

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

    50.24 cm

    Circumference C = 2πr = 2 × 3.14 × 8 = 50.24 cm.

  4. 4. 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.

  5. 5. A circle has radius 13 cm. Using π = 3.14, find its area.

    530.66 cm²

    Area A = πr² = 3.14 × 13² = 530.66 cm².

  6. 6. 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.

  7. 7. 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.

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

    37.68 cm

    Circumference C = 2πr = 2 × 3.14 × 6 = 37.68 cm.

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

    75.36 cm

    Circumference C = 2πr = 2 × 3.14 × 12 = 75.36 cm.

  10. 10. 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.

  11. 11. A circle has radius 16 cm. Using π = 3.14, find its circumference.

    100.48 cm

    Circumference C = 2πr = 2 × 3.14 × 16 = 100.48 cm.

  12. 12. A circle has radius 7 cm. Using π = 3.14, find its area.

    153.86 cm²

    Area A = πr² = 3.14 × 7² = 153.86 cm².

12 questions · Seed 44 · Age guidance, not curriculum certification