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Year 7 Circumference and Area of Circles Worksheet — Level 1 — Practice Set 3 — 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 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 24 cm. What is its radius?

Answer: 12 cm

The radius is half the diameter.

2.A circle has a radius of 19 cm. What is its diameter?

Answer: 38 cm

The diameter is twice the radius.

3.A circle has a diameter of 16 cm. Find its circumference, correct to 1 decimal place.

Answer: 50.3 cm

  1. C = π × d = π × 16
  2. ≈ 50.3 cm
4.A circle has a diameter of 26 cm. What is its radius?

Answer: 13 cm

The radius is half the diameter.

5.A circle has a diameter of 38 cm. Find its circumference, correct to 1 decimal place.

Answer: 119.4 cm

  1. C = π × d = π × 38
  2. ≈ 119.4 cm
6.A circle has a radius of 20 cm. Find its circumference, correct to 1 decimal place.

Answer: 125.7 cm

  1. C = 2 × π × r = 2 × π × 20
  2. ≈ 125.7 cm
7.A circle has a diameter of 40 cm. Find its area, correct to 1 decimal place.

Answer: 1256.6 cm2

  1. r = 40 ÷ 2 = 20 cm
  2. A = π × r2 = π × 202 = π × 400
  3. ≈ 1256.6 cm2
8.A circle has a radius of 6 cm. Find its area, correct to 1 decimal place.

Answer: 113.1 cm2

  1. A = π × r2 = π × 62 = π × 36
  2. ≈ 113.1 cm2
9.A circle has a radius of 4 cm. What is its diameter?

Answer: 8 cm

The diameter is twice the radius.

10.A circle has a diameter of 16 cm. Find its area, correct to 1 decimal place.

Answer: 201.1 cm2

  1. r = 16 ÷ 2 = 8 cm
  2. A = π × r2 = π × 82 = π × 64
  3. ≈ 201.1 cm2
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