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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 diameter of 14 cm. What is its radius?

Answer: 7 cm

The radius is half the diameter.

2.A circle has a diameter of 12 cm. Find its area, correct to 1 decimal place.

Answer: 113.1 cm2

  1. r = 12 ÷ 2 = 6 cm
  2. A = π × r2 = π × 62 = π × 36
  3. ≈ 113.1 cm2
3.A circle has a radius of 13 cm. Find its area, correct to 1 decimal place.

Answer: 530.9 cm2

  1. A = π × r2 = π × 132 = π × 169
  2. ≈ 530.9 cm2
4.A circle has a radius of 15 cm. Find its circumference, correct to 1 decimal place.

Answer: 94.2 cm

  1. C = 2 × π × r = 2 × π × 15
  2. ≈ 94.2 cm
5.A circle has a diameter of 6 cm. Find its circumference, correct to 1 decimal place.

Answer: 18.8 cm

  1. C = π × d = π × 6
  2. ≈ 18.8 cm
6.A circle has a diameter of 28 cm. Find its circumference, correct to 1 decimal place.

Answer: 88.0 cm

  1. C = π × d = π × 28
  2. ≈ 88.0 cm
7.A circle has a diameter of 10 cm. Find its circumference, correct to 1 decimal place.

Answer: 31.4 cm

  1. C = π × d = π × 10
  2. ≈ 31.4 cm
8.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
9.A circle has a diameter of 10 cm. What is its radius?

Answer: 5 cm

The radius is half the diameter.

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

Answer: 25.1 cm

  1. C = π × d = π × 8
  2. ≈ 25.1 cm
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