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Year 8 Circumference and Area of Circles Worksheet — Level 1 — Practice Set 2 — 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 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 6 cm. What is its diameter?

Answer: 12 cm

The diameter is twice the radius.

2.A circle has a radius of 2 cm. What is its diameter?

Answer: 4 cm

The diameter is twice the radius.

3.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
4.A circle has a radius of 18 cm. Find its area, correct to 1 decimal place.

Answer: 1017.9 cm2

  1. A = π × r2 = π × 182 = π × 324
  2. ≈ 1017.9 cm2
5.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
6.A circle has a diameter of 10 cm. Find its area, correct to 1 decimal place.

Answer: 78.5 cm2

  1. r = 10 ÷ 2 = 5 cm
  2. A = π × r2 = π × 52 = π × 25
  3. ≈ 78.5 cm2
7.A circle has a diameter of 16 cm. What is its radius?

Answer: 8 cm

The radius is half the diameter.

8.A circle has a radius of 12 cm. Find its circumference, correct to 1 decimal place.

Answer: 75.4 cm

  1. C = 2 × π × r = 2 × π × 12
  2. ≈ 75.4 cm
9.A circle has a radius of 12 cm. What is its diameter?

Answer: 24 cm

The diameter is twice the radius.

10.A circle has a diameter of 18 cm. Find its circumference, correct to 1 decimal place.

Answer: 56.5 cm

  1. C = π × d = π × 18
  2. ≈ 56.5 cm
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