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MathsAges 16-18

Circle arc length & sector area

Use θ ÷ 360° with π = 3.14 to calculate the arc length or area of a circular sector. 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 arc length & sector area

Take your time. Show your thinking.

  1. 1. A circular sector has radius 48 cm and central angle 120°. Using π = 3.14, calculate its arc length.

    Sector: r = 48 cm, θ = 120° · L = (θ/360°) × 2πr

  2. 2. A circular sector has radius 42 cm and central angle 300°. Using π = 3.14, calculate its arc length.

    Sector: r = 42 cm, θ = 300° · L = (θ/360°) × 2πr

  3. 3. A circular sector has radius 30 cm and central angle 90°. Using π = 3.14, calculate its sector area.

    Sector: r = 30 cm, θ = 90° · A = (θ/360°) × πr²

  4. 4. A circular sector has radius 48 cm and central angle 180°. Using π = 3.14, calculate its arc length.

    Sector: r = 48 cm, θ = 180° · L = (θ/360°) × 2πr

  5. 5. A circular sector has radius 54 cm and central angle 120°. Using π = 3.14, calculate its sector area.

    Sector: r = 54 cm, θ = 120° · A = (θ/360°) × πr²

  6. 6. A circular sector has radius 24 cm and central angle 60°. Using π = 3.14, calculate its arc length.

    Sector: r = 24 cm, θ = 60° · L = (θ/360°) × 2πr

  7. 7. A circular sector has radius 78 cm and central angle 60°. Using π = 3.14, calculate its sector area.

    Sector: r = 78 cm, θ = 60° · A = (θ/360°) × πr²

  8. 8. A circular sector has radius 42 cm and central angle 300°. Using π = 3.14, calculate its sector area.

    Sector: r = 42 cm, θ = 300° · A = (θ/360°) × πr²

  9. 9. A circular sector has radius 66 cm and central angle 180°. Using π = 3.14, calculate its arc length.

    Sector: r = 66 cm, θ = 180° · L = (θ/360°) × 2πr

  10. 10. A circular sector has radius 42 cm and central angle 240°. Using π = 3.14, calculate its sector area.

    Sector: r = 42 cm, θ = 240° · A = (θ/360°) × πr²

  11. 11. A circular sector has radius 84 cm and central angle 180°. Using π = 3.14, calculate its sector area.

    Sector: r = 84 cm, θ = 180° · A = (θ/360°) × πr²

  12. 12. A circular sector has radius 60 cm and central angle 180°. Using π = 3.14, calculate its arc length.

    Sector: r = 60 cm, θ = 180° · L = (θ/360°) × 2πr
12 questions · Seed 104734 · Age guidance, not curriculum certification
View the answer key
Worksheet StudioAnswer key · Ages 16-18

Circle arc length & sector area

Answers and reasoning. Review before teaching.

  1. 1. A circular sector has radius 48 cm and central angle 120°. Using π = 3.14, calculate its arc length.

    100.48 cm

    Arc length L = (120° ÷ 360°) × 2 × 3.14 × 48 = 100.48 cm.

  2. 2. A circular sector has radius 42 cm and central angle 300°. Using π = 3.14, calculate its arc length.

    219.8 cm

    Arc length L = (300° ÷ 360°) × 2 × 3.14 × 42 = 219.8 cm.

  3. 3. A circular sector has radius 30 cm and central angle 90°. Using π = 3.14, calculate its sector area.

    706.5 cm²

    Sector area A = (90° ÷ 360°) × 3.14 × 30² = 706.5 cm².

  4. 4. A circular sector has radius 48 cm and central angle 180°. Using π = 3.14, calculate its arc length.

    150.72 cm

    Arc length L = (180° ÷ 360°) × 2 × 3.14 × 48 = 150.72 cm.

  5. 5. A circular sector has radius 54 cm and central angle 120°. Using π = 3.14, calculate its sector area.

    3052.08 cm²

    Sector area A = (120° ÷ 360°) × 3.14 × 54² = 3052.08 cm².

  6. 6. A circular sector has radius 24 cm and central angle 60°. Using π = 3.14, calculate its arc length.

    25.12 cm

    Arc length L = (60° ÷ 360°) × 2 × 3.14 × 24 = 25.12 cm.

  7. 7. A circular sector has radius 78 cm and central angle 60°. Using π = 3.14, calculate its sector area.

    3183.96 cm²

    Sector area A = (60° ÷ 360°) × 3.14 × 78² = 3183.96 cm².

  8. 8. A circular sector has radius 42 cm and central angle 300°. Using π = 3.14, calculate its sector area.

    4615.8 cm²

    Sector area A = (300° ÷ 360°) × 3.14 × 42² = 4615.8 cm².

  9. 9. A circular sector has radius 66 cm and central angle 180°. Using π = 3.14, calculate its arc length.

    207.24 cm

    Arc length L = (180° ÷ 360°) × 2 × 3.14 × 66 = 207.24 cm.

  10. 10. A circular sector has radius 42 cm and central angle 240°. Using π = 3.14, calculate its sector area.

    3692.64 cm²

    Sector area A = (240° ÷ 360°) × 3.14 × 42² = 3692.64 cm².

  11. 11. A circular sector has radius 84 cm and central angle 180°. Using π = 3.14, calculate its sector area.

    11077.92 cm²

    Sector area A = (180° ÷ 360°) × 3.14 × 84² = 11077.92 cm².

  12. 12. A circular sector has radius 60 cm and central angle 180°. Using π = 3.14, calculate its arc length.

    188.4 cm

    Arc length L = (180° ÷ 360°) × 2 × 3.14 × 60 = 188.4 cm.

12 questions · Seed 104734 · Age guidance, not curriculum certification
Worksheet StudioPractice pack · Ages 16-18

Circle arc length & sector area

Take your time. Show your thinking.

  1. 1. A circular sector has radius 48 cm and central angle 120°. Using π = 3.14, calculate its arc length.

    Sector: r = 48 cm, θ = 120° · L = (θ/360°) × 2πr

  2. 2. A circular sector has radius 42 cm and central angle 300°. Using π = 3.14, calculate its arc length.

    Sector: r = 42 cm, θ = 300° · L = (θ/360°) × 2πr

  3. 3. A circular sector has radius 30 cm and central angle 90°. Using π = 3.14, calculate its sector area.

    Sector: r = 30 cm, θ = 90° · A = (θ/360°) × πr²

  4. 4. A circular sector has radius 48 cm and central angle 180°. Using π = 3.14, calculate its arc length.

    Sector: r = 48 cm, θ = 180° · L = (θ/360°) × 2πr

  5. 5. A circular sector has radius 54 cm and central angle 120°. Using π = 3.14, calculate its sector area.

    Sector: r = 54 cm, θ = 120° · A = (θ/360°) × πr²

  6. 6. A circular sector has radius 24 cm and central angle 60°. Using π = 3.14, calculate its arc length.

    Sector: r = 24 cm, θ = 60° · L = (θ/360°) × 2πr

  7. 7. A circular sector has radius 78 cm and central angle 60°. Using π = 3.14, calculate its sector area.

    Sector: r = 78 cm, θ = 60° · A = (θ/360°) × πr²

  8. 8. A circular sector has radius 42 cm and central angle 300°. Using π = 3.14, calculate its sector area.

    Sector: r = 42 cm, θ = 300° · A = (θ/360°) × πr²

  9. 9. A circular sector has radius 66 cm and central angle 180°. Using π = 3.14, calculate its arc length.

    Sector: r = 66 cm, θ = 180° · L = (θ/360°) × 2πr

  10. 10. A circular sector has radius 42 cm and central angle 240°. Using π = 3.14, calculate its sector area.

    Sector: r = 42 cm, θ = 240° · A = (θ/360°) × πr²

  11. 11. A circular sector has radius 84 cm and central angle 180°. Using π = 3.14, calculate its sector area.

    Sector: r = 84 cm, θ = 180° · A = (θ/360°) × πr²

  12. 12. A circular sector has radius 60 cm and central angle 180°. Using π = 3.14, calculate its arc length.

    Sector: r = 60 cm, θ = 180° · L = (θ/360°) × 2πr
12 questions · Seed 104734 · Age guidance, not curriculum certification
Worksheet StudioAnswer key · Ages 16-18

Circle arc length & sector area

Answers and reasoning. Review before teaching.

  1. 1. A circular sector has radius 48 cm and central angle 120°. Using π = 3.14, calculate its arc length.

    100.48 cm

    Arc length L = (120° ÷ 360°) × 2 × 3.14 × 48 = 100.48 cm.

  2. 2. A circular sector has radius 42 cm and central angle 300°. Using π = 3.14, calculate its arc length.

    219.8 cm

    Arc length L = (300° ÷ 360°) × 2 × 3.14 × 42 = 219.8 cm.

  3. 3. A circular sector has radius 30 cm and central angle 90°. Using π = 3.14, calculate its sector area.

    706.5 cm²

    Sector area A = (90° ÷ 360°) × 3.14 × 30² = 706.5 cm².

  4. 4. A circular sector has radius 48 cm and central angle 180°. Using π = 3.14, calculate its arc length.

    150.72 cm

    Arc length L = (180° ÷ 360°) × 2 × 3.14 × 48 = 150.72 cm.

  5. 5. A circular sector has radius 54 cm and central angle 120°. Using π = 3.14, calculate its sector area.

    3052.08 cm²

    Sector area A = (120° ÷ 360°) × 3.14 × 54² = 3052.08 cm².

  6. 6. A circular sector has radius 24 cm and central angle 60°. Using π = 3.14, calculate its arc length.

    25.12 cm

    Arc length L = (60° ÷ 360°) × 2 × 3.14 × 24 = 25.12 cm.

  7. 7. A circular sector has radius 78 cm and central angle 60°. Using π = 3.14, calculate its sector area.

    3183.96 cm²

    Sector area A = (60° ÷ 360°) × 3.14 × 78² = 3183.96 cm².

  8. 8. A circular sector has radius 42 cm and central angle 300°. Using π = 3.14, calculate its sector area.

    4615.8 cm²

    Sector area A = (300° ÷ 360°) × 3.14 × 42² = 4615.8 cm².

  9. 9. A circular sector has radius 66 cm and central angle 180°. Using π = 3.14, calculate its arc length.

    207.24 cm

    Arc length L = (180° ÷ 360°) × 2 × 3.14 × 66 = 207.24 cm.

  10. 10. A circular sector has radius 42 cm and central angle 240°. Using π = 3.14, calculate its sector area.

    3692.64 cm²

    Sector area A = (240° ÷ 360°) × 3.14 × 42² = 3692.64 cm².

  11. 11. A circular sector has radius 84 cm and central angle 180°. Using π = 3.14, calculate its sector area.

    11077.92 cm²

    Sector area A = (180° ÷ 360°) × 3.14 × 84² = 11077.92 cm².

  12. 12. A circular sector has radius 60 cm and central angle 180°. Using π = 3.14, calculate its arc length.

    188.4 cm

    Arc length L = (180° ÷ 360°) × 2 × 3.14 × 60 = 188.4 cm.

12 questions · Seed 104734 · Age guidance, not curriculum certification