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Year 7 Circumference and Area of Circles Worksheet — Level 2 — 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 2 — 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 26 cm. Find its area, correct to 1 decimal place.

Answer: 530.9 cm2

  1. r = 26 ÷ 2 = 13 cm
  2. A = π × r2 = π × 132 = π × 169
  3. ≈ 530.9 cm2
2.Find the area of a semicircle with a radius of 2 cm, correct to 1 decimal place.

Answer: 6.3 cm2

  1. A = ½ × π × r2 = ½ × π × 4
  2. ≈ 6.3 cm2
3.Find the area of a semicircle with a radius of 16 cm, correct to 1 decimal place.

Answer: 402.1 cm2

  1. A = ½ × π × r2 = ½ × π × 256
  2. ≈ 402.1 cm2
4.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
5.A circle has a diameter of 28 cm. Find its area, correct to 1 decimal place.

Answer: 615.8 cm2

  1. r = 28 ÷ 2 = 14 cm
  2. A = π × r2 = π × 142 = π × 196
  3. ≈ 615.8 cm2
6.A circle has a diameter of 22 cm. Find its area, correct to 1 decimal place.

Answer: 380.1 cm2

  1. r = 22 ÷ 2 = 11 cm
  2. A = π × r2 = π × 112 = π × 121
  3. ≈ 380.1 cm2
7.A circle has a radius of 5 cm. Find its circumference, correct to 1 decimal place.

Answer: 31.4 cm

  1. C = 2 × π × r = 2 × π × 5
  2. ≈ 31.4 cm
8.A circle has a radius of 12 cm. Find its circumference, correct to 1 decimal place.

Answer: 75.4 cm

  1. C = 2 × π × r = 2 × π × 12
  2. ≈ 75.4 cm
9.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
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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