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Year 7 Circumference and Area of Circles Worksheet — Level 2 — 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 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 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
2.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
3.A circle has a radius of 2 cm. Find its circumference, correct to 1 decimal place.

Answer: 12.6 cm

  1. C = 2 × π × r = 2 × π × 2
  2. ≈ 12.6 cm
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 radius of 15 cm. Find its area, correct to 1 decimal place.

Answer: 706.9 cm2

  1. A = π × r2 = π × 152 = π × 225
  2. ≈ 706.9 cm2
6.A circle has a radius of 20 cm. Find its area, correct to 1 decimal place.

Answer: 1256.6 cm2

  1. A = π × r2 = π × 202 = π × 400
  2. ≈ 1256.6 cm2
7.A circle has a diameter of 14 cm. Find its area, correct to 1 decimal place.

Answer: 153.9 cm2

  1. r = 14 ÷ 2 = 7 cm
  2. A = π × r2 = π × 72 = π × 49
  3. ≈ 153.9 cm2
8.Find the area of a semicircle with a radius of 18 cm, correct to 1 decimal place.

Answer: 508.9 cm2

  1. A = ½ × π × r2 = ½ × π × 324
  2. ≈ 508.9 cm2
9.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
10.Find the area of a semicircle with a radius of 3 cm, correct to 1 decimal place.

Answer: 14.1 cm2

  1. A = ½ × π × r2 = ½ × π × 9
  2. ≈ 14.1 cm2
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