Year 7 Circumference and Area of Circles Worksheet — Level 1 — Practice Set 3 — Answers
Answer sheet with worked solutions for the Year 7 area & perimeter worksheet.
Success TutoringWorksheetsAnswer sheetYear 7 · Mathematics · Area & PerimeterYear 7 Circumference and Area of Circles Worksheet — Level 1 — Practice Set 3 — 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 24 cm. What is its radius?
Answer: 12 cm
The radius is half the diameter.
2.A circle has a diameter of 10 cm. Find its area, correct to 1 decimal place.
Answer: 78.5 cm2
- r = 10 ÷ 2 = 5 cm
- A = π × r2 = π × 52 = π × 25
- ≈ 78.5 cm2
3.A circle has a radius of 11 cm. Find its circumference, correct to 1 decimal place.
Answer: 69.1 cm
- C = 2 × π × r = 2 × π × 11
- ≈ 69.1 cm
4.A circle has a diameter of 40 cm. What is its radius?
Answer: 20 cm
The radius is half the diameter.
5.A circle has a diameter of 12 cm. Find its area, correct to 1 decimal place.
Answer: 113.1 cm2
- r = 12 ÷ 2 = 6 cm
- A = π × r2 = π × 62 = π × 36
- ≈ 113.1 cm2
6.A circle has a diameter of 4 cm. Find its circumference, correct to 1 decimal place.
Answer: 12.6 cm
- C = π × d = π × 4
- ≈ 12.6 cm
7.A circle has a diameter of 6 cm. Find its circumference, correct to 1 decimal place.
Answer: 18.8 cm
- C = π × d = π × 6
- ≈ 18.8 cm
8.A circle has a radius of 14 cm. What is its diameter?
Answer: 28 cm
The diameter is twice the radius.
9.A circle has a radius of 13 cm. What is its diameter?
Answer: 26 cm
The diameter is twice the radius.
10.A circle has a radius of 11 cm. What is its diameter?
Answer: 22 cm
The diameter is twice the radius.
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