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Year 10 Circumference and Area of Circles Worksheet — Level 1 — Practice Set 2 — 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 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 radius of 11 cm. Find its area, correct to 1 decimal place.

Answer: 380.1 cm2

  1. A = π × r2 = π × 112 = π × 121
  2. ≈ 380.1 cm2
2.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
3.A circle has a radius of 6 cm. Find its area, correct to 1 decimal place.

Answer: 113.1 cm2

  1. A = π × r2 = π × 62 = π × 36
  2. ≈ 113.1 cm2
4.A circle has a radius of 6 cm. What is its diameter?

Answer: 12 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 34 cm. What is its radius?

Answer: 17 cm

The radius is half the diameter.

7.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
8.A circle has a radius of 14 cm. What is its diameter?

Answer: 28 cm

The diameter is twice the radius.

9.A circle has a radius of 14 cm. Find its circumference, correct to 1 decimal place.

Answer: 88.0 cm

  1. C = 2 × π × r = 2 × π × 14
  2. ≈ 88.0 cm
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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