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Year 9 Circumference and Area of Circles Worksheet — Level 1 — Practice Set 2 — Answers

Answer sheet with worked solutions for the Year 9 area & perimeter worksheet.

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Success TutoringWorksheetsAnswer sheetYear 9 · Mathematics · Area & Perimeter

Year 9 Circumference and Area of Circles Worksheet — Level 1 — 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 28 cm. Find its area, correct to 1 decimal place.

Answer: 615.8 cm2

  1. r = 28 ÷ 2 = 14 cm
  2. A = π × r2 = π × 142 = π × 196
  3. ≈ 615.8 cm2
2.A circle has a diameter of 22 cm. Find its area, correct to 1 decimal place.

Answer: 380.1 cm2

  1. r = 22 ÷ 2 = 11 cm
  2. A = π × r2 = π × 112 = π × 121
  3. ≈ 380.1 cm2
3.A circle has a radius of 10 cm. Find its circumference, correct to 1 decimal place.

Answer: 62.8 cm

  1. C = 2 × π × r = 2 × π × 10
  2. ≈ 62.8 cm
4.A circle has a radius of 12 cm. What is its diameter?

Answer: 24 cm

The diameter is twice the radius.

5.A circle has a diameter of 22 cm. Find its circumference, correct to 1 decimal place.

Answer: 69.1 cm

  1. C = π × d = π × 22
  2. ≈ 69.1 cm
6.A circle has a diameter of 4 cm. Find its area, correct to 1 decimal place.

Answer: 12.6 cm2

  1. r = 4 ÷ 2 = 2 cm
  2. A = π × r2 = π × 22 = π × 4
  3. ≈ 12.6 cm2
7.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
8.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
9.A circle has a radius of 14 cm. Find its area, correct to 1 decimal place.

Answer: 615.8 cm2

  1. A = π × r2 = π × 142 = π × 196
  2. ≈ 615.8 cm2
10.A circle has a diameter of 12 cm. Find its circumference, correct to 1 decimal place.

Answer: 37.7 cm

  1. C = π × d = π × 12
  2. ≈ 37.7 cm
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