Success TutoringWorksheets

Year 9 Circumference and Area of Circles Worksheet — Level 1 — Practice Set 2 — Answers

Answer sheet with worked solutions for the Year 9 area & perimeter worksheet.

Download answers PDFPrint answersBack to worksheet
Success TutoringWorksheetsAnswer sheetYear 9 · Mathematics · Area & Perimeter

Year 9 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 8 cm. Find its circumference, correct to 1 decimal place.

Answer: 50.3 cm

  1. C = 2 × π × r = 2 × π × 8
  2. ≈ 50.3 cm
2.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
3.A circle has a diameter of 40 cm. Find its area, correct to 1 decimal place.

Answer: 1256.6 cm2

  1. r = 40 ÷ 2 = 20 cm
  2. A = π × r2 = π × 202 = π × 400
  3. ≈ 1256.6 cm2
4.A circle has a diameter of 12 cm. Find its circumference, correct to 1 decimal place.

Answer: 37.7 cm

  1. C = π × d = π × 12
  2. ≈ 37.7 cm
5.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
6.A circle has a radius of 20 cm. What is its diameter?

Answer: 40 cm

The diameter is twice the radius.

7.A circle has a radius of 17 cm. What is its diameter?

Answer: 34 cm

The diameter is twice the radius.

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

Answer: 14 cm

The diameter is twice the radius.

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

Answer: 50.3 cm2

  1. r = 8 ÷ 2 = 4 cm
  2. A = π × r2 = π × 42 = π × 16
  3. ≈ 50.3 cm2
10.A circle has a diameter of 14 cm. What is its radius?

Answer: 7 cm

The radius is half the diameter.

Free worksheets at worksheets.successtutoring.com · © Success Tutoring · Free for personal and classroom use

Marking tips

  • Give credit for correct method even when the final answer slips — the working shows where the thinking went right.
  • For open-ended tasks, use the success criteria as a checklist rather than looking for one "right" answer.
  • Celebrate what went well first, then pick one thing to work on next.

Great work. Here's what to try next: