6th Grade Circumference and Area of Circles Worksheet — Level 1 — Practice Set 3 — Answers
Answer sheet with worked solutions for the 6th Grade area & perimeter worksheet.
Success TutoringWorksheetsAnswer sheet6th Grade · Mathematics · Area & Perimeter6th Grade Circumference and Area of Circles Worksheet — Level 1 — Practice Set 3 — 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 7 cm. Find its area, correct to 1 decimal place.
Answer: 153.9 cm2
- A = π × r2 = π × 72 = π × 49
- ≈ 153.9 cm2
2.A circle has a diameter of 40 cm. What is its radius?
Answer: 20 cm
The radius is half the diameter.
3.A circle has a diameter of 14 cm. Find its area, correct to 1 decimal place.
Answer: 153.9 cm2
- r = 14 ÷ 2 = 7 cm
- A = π × r2 = π × 72 = π × 49
- ≈ 153.9 cm2
4.A circle has a radius of 12 cm. What is its diameter?
Answer: 24 cm
The diameter is twice the radius.
5.A circle has a radius of 15 cm. What is its diameter?
Answer: 30 cm
The diameter is twice the radius.
6.A circle has a radius of 20 cm. Find its area, correct to 1 decimal place.
Answer: 1256.6 cm2
- A = π × r2 = π × 202 = π × 400
- ≈ 1256.6 cm2
7.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
8.A circle has a radius of 3 cm. Find its circumference, correct to 1 decimal place.
Answer: 18.8 cm
- C = 2 × π × r = 2 × π × 3
- ≈ 18.8 cm
9.A circle has a diameter of 30 cm. Find its circumference, correct to 1 decimal place.
Answer: 94.2 cm
- C = π × d = π × 30
- ≈ 94.2 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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