Year 7 Circumference and Area of Circles Worksheet — Level 1 — 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 — 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 32 cm. Find its area, correct to 1 decimal place.
Answer: 804.2 cm2
- r = 32 ÷ 2 = 16 cm
- A = π × r2 = π × 162 = π × 256
- ≈ 804.2 cm2
2.A circle has a radius of 14 cm. What is its diameter?
Answer: 28 cm
The diameter is twice the radius.
3.A circle has a diameter of 38 cm. What is its radius?
Answer: 19 cm
The radius is half the diameter.
4.A circle has a diameter of 34 cm. Find its circumference, correct to 1 decimal place.
Answer: 106.8 cm
- C = π × d = π × 34
- ≈ 106.8 cm
5.A circle has a radius of 9 cm. Find its circumference, correct to 1 decimal place.
Answer: 56.5 cm
- C = 2 × π × r = 2 × π × 9
- ≈ 56.5 cm
6.A circle has a radius of 10 cm. What is its diameter?
Answer: 20 cm
The diameter is twice the radius.
7.A circle has a diameter of 16 cm. Find its circumference, correct to 1 decimal place.
Answer: 50.3 cm
- C = π × d = π × 16
- ≈ 50.3 cm
8.A circle has a radius of 16 cm. Find its area, correct to 1 decimal place.
Answer: 804.2 cm2
- A = π × r2 = π × 162 = π × 256
- ≈ 804.2 cm2
9.A circle has a diameter of 36 cm. Find its circumference, correct to 1 decimal place.
Answer: 113.1 cm
- C = π × d = π × 36
- ≈ 113.1 cm
10.A circle has a radius of 4 cm. What is its diameter?
Answer: 8 cm
The diameter is twice the radius.
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