7th Grade Circumference and Area of Circles Worksheet — Level 1 — 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 — 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 diameter of 12 cm. What is its radius?
Answer: 6 cm
The radius is half the diameter.
2.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
3.A circle has a radius of 2 cm. Find its circumference, correct to 1 decimal place.
Answer: 12.6 cm
- C = 2 × π × r = 2 × π × 2
- ≈ 12.6 cm
4.A circle has a radius of 15 cm. Find its circumference, correct to 1 decimal place.
Answer: 94.2 cm
- C = 2 × π × r = 2 × π × 15
- ≈ 94.2 cm
5.A circle has a diameter of 16 cm. What is its radius?
Answer: 8 cm
The radius is half the diameter.
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 13 cm. Find its circumference, correct to 1 decimal place.
Answer: 81.7 cm
- C = 2 × π × r = 2 × π × 13
- ≈ 81.7 cm
8.A circle has a radius of 16 cm. What is its diameter?
Answer: 32 cm
The diameter is twice the radius.
9.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
10.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
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