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Year 8 Circumference and Area of Circles Worksheet — Level 2 — Practice Set 2 — Answers

Answer sheet with worked solutions for the Year 8 area & perimeter worksheet.

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Success TutoringWorksheetsAnswer sheetYear 8 · Mathematics · Area & Perimeter

Year 8 Circumference and Area of Circles Worksheet — Level 2 — Practice Set 2 — Answers

Show your working. Use the π button on your calculator and round to 1 decimal place unless told otherwise.

1.A circle has a diameter of 6 cm. Find its area, correct to 1 decimal place.

Answer: 28.3 cm2

  1. r = 6 ÷ 2 = 3 cm
  2. A = π × r2 = π × 32 = π × 9
  3. ≈ 28.3 cm2
2.A circle has a diameter of 40 cm. Find its area, correct to 1 decimal place.

Answer: 1256.6 cm2

  1. r = 40 ÷ 2 = 20 cm
  2. A = π × r2 = π × 202 = π × 400
  3. ≈ 1256.6 cm2
3.A circle has a radius of 20 cm. Find its circumference, correct to 1 decimal place.

Answer: 125.7 cm

  1. C = 2 × π × r = 2 × π × 20
  2. ≈ 125.7 cm
4.A circle has a diameter of 14 cm. Find its circumference, correct to 1 decimal place.

Answer: 44.0 cm

  1. C = π × d = π × 14
  2. ≈ 44.0 cm
5.Find the area of a semicircle with a radius of 15 cm, correct to 1 decimal place.

Answer: 353.4 cm2

  1. A = ½ × π × r2 = ½ × π × 225
  2. ≈ 353.4 cm2
6.A circle has a diameter of 8 cm. Find its area, correct to 1 decimal place.

Answer: 50.3 cm2

  1. r = 8 ÷ 2 = 4 cm
  2. A = π × r2 = π × 42 = π × 16
  3. ≈ 50.3 cm2
7.A circle has a diameter of 18 cm. Find its circumference, correct to 1 decimal place.

Answer: 56.5 cm

  1. C = π × d = π × 18
  2. ≈ 56.5 cm
8.A circle has a radius of 2 cm. Find its area, correct to 1 decimal place.

Answer: 12.6 cm2

  1. A = π × r2 = π × 22 = π × 4
  2. ≈ 12.6 cm2
9.A circle has a radius of 3 cm. Find its circumference, correct to 1 decimal place.

Answer: 18.8 cm

  1. C = 2 × π × r = 2 × π × 3
  2. ≈ 18.8 cm
10.Find the area of a semicircle with a radius of 9 cm, correct to 1 decimal place.

Answer: 127.2 cm2

  1. A = ½ × π × r2 = ½ × π × 81
  2. ≈ 127.2 cm2
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