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Year 6 Circumference and Area of Circles Worksheet — Level 1 — Practice Set 4 — Answers

Answer sheet with worked solutions for the Year 6 area & perimeter worksheet.

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Success TutoringWorksheetsAnswer sheetYear 6 · Mathematics · Area & Perimeter

Year 6 Circumference and Area of Circles Worksheet — Level 1 — 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 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
2.A circle has a diameter of 20 cm. What is its radius?

Answer: 10 cm

The radius is half the diameter.

3.A circle has a radius of 10 cm. What is its diameter?

Answer: 20 cm

The diameter is twice the radius.

4.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
5.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
6.A circle has a radius of 20 cm. What is its diameter?

Answer: 40 cm

The diameter is twice the radius.

7.A circle has a diameter of 30 cm. Find its area, correct to 1 decimal place.

Answer: 706.9 cm2

  1. r = 30 ÷ 2 = 15 cm
  2. A = π × r2 = π × 152 = π × 225
  3. ≈ 706.9 cm2
8.A circle has a diameter of 8 cm. Find its area, correct to 1 decimal place.

Answer: 50.3 cm2

  1. r = 8 ÷ 2 = 4 cm
  2. A = π × r2 = π × 42 = π × 16
  3. ≈ 50.3 cm2
9.A circle has a radius of 14 cm. What is its diameter?

Answer: 28 cm

The diameter is twice the radius.

10.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
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