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Year 10 Circumference and Area of Circles Worksheet — Level 2 — Practice Set 4 — Answers

Answer sheet with worked solutions for the Year 10 area & perimeter worksheet.

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Success TutoringWorksheetsAnswer sheetYear 10 · Mathematics · Area & Perimeter

Year 10 Circumference and Area of Circles Worksheet — Level 2 — Practice Set 4 — 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 radius of 9 cm. Find its circumference, correct to 1 decimal place.

Answer: 56.5 cm

  1. C = 2 × π × r = 2 × π × 9
  2. ≈ 56.5 cm
2.A circle has a radius of 12 cm. Find its circumference, correct to 1 decimal place.

Answer: 75.4 cm

  1. C = 2 × π × r = 2 × π × 12
  2. ≈ 75.4 cm
3.A circle has a radius of 15 cm. Find its circumference, correct to 1 decimal place.

Answer: 94.2 cm

  1. C = 2 × π × r = 2 × π × 15
  2. ≈ 94.2 cm
4.A circle has a radius of 18 cm. Find its area, correct to 1 decimal place.

Answer: 1017.9 cm2

  1. A = π × r2 = π × 182 = π × 324
  2. ≈ 1017.9 cm2
5.A circle has a diameter of 34 cm. Find its circumference, correct to 1 decimal place.

Answer: 106.8 cm

  1. C = π × d = π × 34
  2. ≈ 106.8 cm
6.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
7.A circle has a diameter of 26 cm. Find its area, correct to 1 decimal place.

Answer: 530.9 cm2

  1. r = 26 ÷ 2 = 13 cm
  2. A = π × r2 = π × 132 = π × 169
  3. ≈ 530.9 cm2
8.A circle has a diameter of 36 cm. Find its area, correct to 1 decimal place.

Answer: 1017.9 cm2

  1. r = 36 ÷ 2 = 18 cm
  2. A = π × r2 = π × 182 = π × 324
  3. ≈ 1017.9 cm2
9.Find the area of a semicircle with a radius of 16 cm, correct to 1 decimal place.

Answer: 402.1 cm2

  1. A = ½ × π × r2 = ½ × π × 256
  2. ≈ 402.1 cm2
10.Find the area of a semicircle with a radius of 20 cm, correct to 1 decimal place.

Answer: 628.3 cm2

  1. A = ½ × π × r2 = ½ × π × 400
  2. ≈ 628.3 cm2
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