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Year 10 Circumference and Area of Circles Worksheet — Level 2 — Practice Set 3 — 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 3 — Answers

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

1.Find the area of a semicircle with a radius of 6 cm, correct to 1 decimal place.

Answer: 56.5 cm2

  1. A = ½ × π × r2 = ½ × π × 36
  2. ≈ 56.5 cm2
2.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
3.A circle has a diameter of 28 cm. Find its circumference, correct to 1 decimal place.

Answer: 88.0 cm

  1. C = π × d = π × 28
  2. ≈ 88.0 cm
4.A circle has a radius of 7 cm. Find its circumference, correct to 1 decimal place.

Answer: 44.0 cm

  1. C = 2 × π × r = 2 × π × 7
  2. ≈ 44.0 cm
5.A circle has a radius of 6 cm. Find its circumference, correct to 1 decimal place.

Answer: 37.7 cm

  1. C = 2 × π × r = 2 × π × 6
  2. ≈ 37.7 cm
6.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
7.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
8.A circle has a diameter of 32 cm. Find its area, correct to 1 decimal place.

Answer: 804.2 cm2

  1. r = 32 ÷ 2 = 16 cm
  2. A = π × r2 = π × 162 = π × 256
  3. ≈ 804.2 cm2
9.A circle has a radius of 9 cm. Find its area, correct to 1 decimal place.

Answer: 254.5 cm2

  1. A = π × r2 = π × 92 = π × 81
  2. ≈ 254.5 cm2
10.A circle has a radius of 20 cm. Find its area, correct to 1 decimal place.

Answer: 1256.6 cm2

  1. A = π × r2 = π × 202 = π × 400
  2. ≈ 1256.6 cm2
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