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Year 7 Circumference and Area of Circles Worksheet — Level 1 — Practice Set 4 — Answers

Answer sheet with worked solutions for the Year 7 area & perimeter worksheet.

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Success TutoringWorksheetsAnswer sheetYear 7 · Mathematics · Area & Perimeter

Year 7 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 11 cm. Find its circumference, correct to 1 decimal place.

Answer: 69.1 cm

  1. C = 2 × π × r = 2 × π × 11
  2. ≈ 69.1 cm
2.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
3.A circle has a radius of 11 cm. What is its diameter?

Answer: 22 cm

The diameter is twice the radius.

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

Answer: 6 cm

The diameter is twice the radius.

5.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
6.A circle has a diameter of 36 cm. Find its area, correct to 1 decimal place.

Answer: 1017.9 cm2

  1. r = 36 ÷ 2 = 18 cm
  2. A = π × r2 = π × 182 = π × 324
  3. ≈ 1017.9 cm2
7.A circle has a radius of 18 cm. What is its diameter?

Answer: 36 cm

The diameter is twice the radius.

8.A circle has a diameter of 40 cm. Find its circumference, correct to 1 decimal place.

Answer: 125.7 cm

  1. C = π × d = π × 40
  2. ≈ 125.7 cm
9.A circle has a diameter of 6 cm. What is its radius?

Answer: 3 cm

The radius is half the diameter.

10.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
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