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Year 8 Circumference and Area of Circles Worksheet — Level 1 — Practice Set 3 — Answers

Answer sheet with worked solutions for the Year 8 area & perimeter worksheet.

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Success TutoringWorksheetsAnswer sheetYear 8 · Mathematics · Area & Perimeter

Year 8 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 diameter of 14 cm. What is its radius?

Answer: 7 cm

The radius is half the diameter.

2.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
3.A circle has a diameter of 24 cm. Find its circumference, correct to 1 decimal place.

Answer: 75.4 cm

  1. C = π × d = π × 24
  2. ≈ 75.4 cm
4.A circle has a radius of 13 cm. Find its circumference, correct to 1 decimal place.

Answer: 81.7 cm

  1. C = 2 × π × r = 2 × π × 13
  2. ≈ 81.7 cm
5.A circle has a radius of 19 cm. What is its diameter?

Answer: 38 cm

The diameter is twice the radius.

6.A circle has a diameter of 24 cm. Find its area, correct to 1 decimal place.

Answer: 452.4 cm2

  1. r = 24 ÷ 2 = 12 cm
  2. A = π × r2 = π × 122 = π × 144
  3. ≈ 452.4 cm2
7.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
8.A circle has a diameter of 14 cm. Find its area, correct to 1 decimal place.

Answer: 153.9 cm2

  1. r = 14 ÷ 2 = 7 cm
  2. A = π × r2 = π × 72 = π × 49
  3. ≈ 153.9 cm2
9.A circle has a diameter of 4 cm. Find its circumference, correct to 1 decimal place.

Answer: 12.6 cm

  1. C = π × d = π × 4
  2. ≈ 12.6 cm
10.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
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