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Year 7 Circumference and Area of Circles Worksheet — Level 1 — Practice Set 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 1 — Practice Set 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 4 cm. Find its circumference, correct to 1 decimal place.

Answer: 25.1 cm

  1. C = 2 × π × r = 2 × π × 4
  2. ≈ 25.1 cm
2.A circle has a radius of 17 cm. Find its circumference, correct to 1 decimal place.

Answer: 106.8 cm

  1. C = 2 × π × r = 2 × π × 17
  2. ≈ 106.8 cm
3.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
4.A circle has a radius of 11 cm. Find its area, correct to 1 decimal place.

Answer: 380.1 cm2

  1. A = π × r2 = π × 112 = π × 121
  2. ≈ 380.1 cm2
5.A circle has a diameter of 32 cm. Find its area, correct to 1 decimal place.

Answer: 804.2 cm2

  1. r = 32 ÷ 2 = 16 cm
  2. A = π × r2 = π × 162 = π × 256
  3. ≈ 804.2 cm2
6.A circle has a radius of 4 cm. What is its diameter?

Answer: 8 cm

The diameter is twice the radius.

7.A circle has a radius of 7 cm. What is its diameter?

Answer: 14 cm

The diameter is twice the radius.

8.A circle has a radius of 18 cm. What is its diameter?

Answer: 36 cm

The diameter is twice the radius.

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

Answer: 100.5 cm

  1. C = 2 × π × r = 2 × π × 16
  2. ≈ 100.5 cm
10.A circle has a radius of 8 cm. Find its area, correct to 1 decimal place.

Answer: 201.1 cm2

  1. A = π × r2 = π × 82 = π × 64
  2. ≈ 201.1 cm2
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