Year 10 Circumference and Area of Circles Worksheet — Level 1 — Answers
Answer sheet with worked solutions for the Year 10 area & perimeter worksheet.
Success TutoringWorksheetsAnswer sheetYear 10 · Mathematics · Area & PerimeterYear 10 Circumference and Area of Circles Worksheet — Level 1 — 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. Find its circumference, correct to 1 decimal place.
Answer: 75.4 cm
- C = π × d = π × 24
- ≈ 75.4 cm
2.A circle has a radius of 5 cm. Find its circumference, correct to 1 decimal place.
Answer: 31.4 cm
- C = 2 × π × r = 2 × π × 5
- ≈ 31.4 cm
3.A circle has a radius of 13 cm. What is its diameter?
Answer: 26 cm
The diameter is twice the radius.
4.A circle has a diameter of 20 cm. What is its radius?
Answer: 10 cm
The radius is half the diameter.
5.A circle has a radius of 8 cm. Find its area, correct to 1 decimal place.
Answer: 201.1 cm2
- A = π × r2 = π × 82 = π × 64
- ≈ 201.1 cm2
6.A circle has a diameter of 36 cm. What is its radius?
Answer: 18 cm
The radius is half the diameter.
7.A circle has a radius of 17 cm. Find its area, correct to 1 decimal place.
Answer: 907.9 cm2
- A = π × r2 = π × 172 = π × 289
- ≈ 907.9 cm2
8.A circle has a radius of 16 cm. Find its circumference, correct to 1 decimal place.
Answer: 100.5 cm
- C = 2 × π × r = 2 × π × 16
- ≈ 100.5 cm
9.A circle has a diameter of 28 cm. What is its radius?
Answer: 14 cm
The radius is half the diameter.
10.A circle has a diameter of 8 cm. Find its circumference, correct to 1 decimal place.
Answer: 25.1 cm
- C = π × d = π × 8
- ≈ 25.1 cm
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