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Year 7 Circumference and Area of Circles Worksheet — Level 1 — 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 — 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 17 cm. Find its area, correct to 1 decimal place.

Answer: 907.9 cm2

  1. A = π × r2 = π × 172 = π × 289
  2. ≈ 907.9 cm2
2.A circle has a radius of 19 cm. Find its area, correct to 1 decimal place.

Answer: 1134.1 cm2

  1. A = π × r2 = π × 192 = π × 361
  2. ≈ 1134.1 cm2
3.A circle has a diameter of 30 cm. Find its circumference, correct to 1 decimal place.

Answer: 94.2 cm

  1. C = π × d = π × 30
  2. ≈ 94.2 cm
4.A circle has a radius of 15 cm. What is its diameter?

Answer: 30 cm

The diameter is twice the radius.

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

Answer: 44.0 cm

  1. C = 2 × π × r = 2 × π × 7
  2. ≈ 44.0 cm
7.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
8.A circle has a radius of 12 cm. Find its area, correct to 1 decimal place.

Answer: 452.4 cm2

  1. A = π × r2 = π × 122 = π × 144
  2. ≈ 452.4 cm2
9.A circle has a radius of 2 cm. What is its diameter?

Answer: 4 cm

The diameter is twice the radius.

10.A circle has a diameter of 34 cm. Find its circumference, correct to 1 decimal place.

Answer: 106.8 cm

  1. C = π × d = π × 34
  2. ≈ 106.8 cm
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