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 radius of 9 cm. What is its diameter?
Answer: 18 cm
The diameter is twice the radius.
2.A circle has a diameter of 28 cm. Find its circumference, correct to 1 decimal place.
Answer: 88.0 cm
- C = π × d = π × 28
- ≈ 88.0 cm
3.A circle has a radius of 5 cm. What is its diameter?
Answer: 10 cm
The diameter is twice the radius.
4.A circle has a diameter of 10 cm. Find its circumference, correct to 1 decimal place.
Answer: 31.4 cm
- C = π × d = π × 10
- ≈ 31.4 cm
5.A circle has a radius of 13 cm. What is its diameter?
Answer: 26 cm
The diameter is twice the radius.
6.A circle has a radius of 14 cm. Find its area, correct to 1 decimal place.
Answer: 615.8 cm2
- A = π × r2 = π × 142 = π × 196
- ≈ 615.8 cm2
7.A circle has a diameter of 26 cm. Find its circumference, correct to 1 decimal place.
Answer: 81.7 cm
- C = π × d = π × 26
- ≈ 81.7 cm
8.A circle has a diameter of 20 cm. Find its circumference, correct to 1 decimal place.
Answer: 62.8 cm
- C = π × d = π × 20
- ≈ 62.8 cm
9.A circle has a diameter of 32 cm. Find its circumference, correct to 1 decimal place.
Answer: 100.5 cm
- C = π × d = π × 32
- ≈ 100.5 cm
10.A circle has a radius of 11 cm. Find its area, correct to 1 decimal place.
Answer: 380.1 cm2
- A = π × r2 = π × 112 = π × 121
- ≈ 380.1 cm2
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