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Year 10 Circumference and Area of Circles Worksheet — Level 1 — 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 1 — Practice Set 3 — 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 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
2.A circle has a diameter of 38 cm. What is its radius?

Answer: 19 cm

The radius is half the diameter.

3.A circle has a radius of 4 cm. What is its diameter?

Answer: 8 cm

The diameter is twice the radius.

4.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
5.A circle has a radius of 8 cm. What is its diameter?

Answer: 16 cm

The diameter is twice the radius.

6.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
7.A circle has a diameter of 26 cm. Find its circumference, correct to 1 decimal place.

Answer: 81.7 cm

  1. C = π × d = π × 26
  2. ≈ 81.7 cm
8.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
9.A circle has a diameter of 38 cm. Find its area, correct to 1 decimal place.

Answer: 1134.1 cm2

  1. r = 38 ÷ 2 = 19 cm
  2. A = π × r2 = π × 192 = π × 361
  3. ≈ 1134.1 cm2
10.A circle has a radius of 19 cm. Find its area, correct to 1 decimal place.

Answer: 1134.1 cm2

  1. A = π × r2 = π × 192 = π × 361
  2. ≈ 1134.1 cm2
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