7th Grade Circumference and Area of Circles Worksheet — Level 1 — Practice Set 4 — Answers
Answer sheet with worked solutions for the 7th Grade area & perimeter worksheet.
Success TutoringWorksheetsAnswer sheet7th Grade · Mathematics · Area & Perimeter7th Grade Circumference and Area of Circles Worksheet — Level 1 — Practice Set 4 — Answers
Show your work. Use the π button on your calculator and round to 1 decimal place unless told otherwise.
1.A circle has a radius of 5 cm. Find its area, correct to 1 decimal place.
Answer: 78.5 cm2
- A = π × r2 = π × 52 = π × 25
- ≈ 78.5 cm2
2.A circle has a diameter of 34 cm. Find its area, correct to 1 decimal place.
Answer: 907.9 cm2
- r = 34 ÷ 2 = 17 cm
- A = π × r2 = π × 172 = π × 289
- ≈ 907.9 cm2
3.A circle has a radius of 7 cm. Find its circumference, correct to 1 decimal place.
Answer: 44.0 cm
- C = 2 × π × r = 2 × π × 7
- ≈ 44.0 cm
4.A circle has a diameter of 6 cm. Find its area, correct to 1 decimal place.
Answer: 28.3 cm2
- r = 6 ÷ 2 = 3 cm
- A = π × r2 = π × 32 = π × 9
- ≈ 28.3 cm2
5.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
6.A circle has a radius of 5 cm. What is its diameter?
Answer: 10 cm
The diameter is twice the radius.
7.A circle has a radius of 15 cm. What is its diameter?
Answer: 30 cm
The diameter is twice the radius.
8.A circle has a radius of 19 cm. Find its circumference, correct to 1 decimal place.
Answer: 119.4 cm
- C = 2 × π × r = 2 × π × 19
- ≈ 119.4 cm
9.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
10.A circle has a radius of 8 cm. What is its diameter?
Answer: 16 cm
The diameter is twice the radius.
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