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Circle circumference & area
Use π ≈ 3.14 and radius r to calculate the circumference or area of a circle. Review suitability for your learners before teaching.
Worksheet StudioPractice pack · Ages 13-15
Circle circumference & area
Take your time. Show your thinking.
1. A circle has radius 9 cm. Using π = 3.14, find its area.
2. A circle has radius 8 cm. Using π = 3.14, find its area.
3. A circle has radius 12 cm. Using π = 3.14, find its circumference.
4. A circle has radius 16 cm. Using π = 3.14, find its area.
5. A circle has radius 16 cm. Using π = 3.14, find its circumference.
6. A circle has radius 5 cm. Using π = 3.14, find its area.
7. A circle has radius 18 cm. Using π = 3.14, find its circumference.
8. A circle has radius 19 cm. Using π = 3.14, find its area.
9. A circle has radius 20 cm. Using π = 3.14, find its circumference.
10. A circle has radius 7 cm. Using π = 3.14, find its area.
11. A circle has radius 13 cm. Using π = 3.14, find its circumference.
12. A circle has radius 3 cm. Using π = 3.14, find its circumference.
12 questions · Seed 104737 · Age guidance, not curriculum certification
View the answer key
Worksheet StudioAnswer key · Ages 13-15
Circle circumference & area
Answers and reasoning. Review before teaching.
1. A circle has radius 9 cm. Using π = 3.14, find its area.
254.34 cm²Area A = πr² = 3.14 × 9² = 254.34 cm².
2. A circle has radius 8 cm. Using π = 3.14, find its area.
200.96 cm²Area A = πr² = 3.14 × 8² = 200.96 cm².
3. A circle has radius 12 cm. Using π = 3.14, find its circumference.
75.36 cmCircumference C = 2πr = 2 × 3.14 × 12 = 75.36 cm.
4. A circle has radius 16 cm. Using π = 3.14, find its area.
803.84 cm²Area A = πr² = 3.14 × 16² = 803.84 cm².
5. A circle has radius 16 cm. Using π = 3.14, find its circumference.
100.48 cmCircumference C = 2πr = 2 × 3.14 × 16 = 100.48 cm.
6. A circle has radius 5 cm. Using π = 3.14, find its area.
78.5 cm²Area A = πr² = 3.14 × 5² = 78.5 cm².
7. A circle has radius 18 cm. Using π = 3.14, find its circumference.
113.04 cmCircumference C = 2πr = 2 × 3.14 × 18 = 113.04 cm.
8. A circle has radius 19 cm. Using π = 3.14, find its area.
1133.54 cm²Area A = πr² = 3.14 × 19² = 1133.54 cm².
9. A circle has radius 20 cm. Using π = 3.14, find its circumference.
125.6 cmCircumference C = 2πr = 2 × 3.14 × 20 = 125.6 cm.
10. A circle has radius 7 cm. Using π = 3.14, find its area.
153.86 cm²Area A = πr² = 3.14 × 7² = 153.86 cm².
11. A circle has radius 13 cm. Using π = 3.14, find its circumference.
81.64 cmCircumference C = 2πr = 2 × 3.14 × 13 = 81.64 cm.
12. A circle has radius 3 cm. Using π = 3.14, find its circumference.
18.84 cmCircumference C = 2πr = 2 × 3.14 × 3 = 18.84 cm.
12 questions · Seed 104737 · Age guidance, not curriculum certification
Worksheet StudioPractice pack · Ages 13-15
Circle circumference & area
Take your time. Show your thinking.
1. A circle has radius 9 cm. Using π = 3.14, find its area.
2. A circle has radius 8 cm. Using π = 3.14, find its area.
3. A circle has radius 12 cm. Using π = 3.14, find its circumference.
4. A circle has radius 16 cm. Using π = 3.14, find its area.
5. A circle has radius 16 cm. Using π = 3.14, find its circumference.
6. A circle has radius 5 cm. Using π = 3.14, find its area.
7. A circle has radius 18 cm. Using π = 3.14, find its circumference.
8. A circle has radius 19 cm. Using π = 3.14, find its area.
9. A circle has radius 20 cm. Using π = 3.14, find its circumference.
10. A circle has radius 7 cm. Using π = 3.14, find its area.
11. A circle has radius 13 cm. Using π = 3.14, find its circumference.
12. A circle has radius 3 cm. Using π = 3.14, find its circumference.
12 questions · Seed 104737 · Age guidance, not curriculum certification
Worksheet StudioAnswer key · Ages 13-15
Circle circumference & area
Answers and reasoning. Review before teaching.
1. A circle has radius 9 cm. Using π = 3.14, find its area.
254.34 cm²Area A = πr² = 3.14 × 9² = 254.34 cm².
2. A circle has radius 8 cm. Using π = 3.14, find its area.
200.96 cm²Area A = πr² = 3.14 × 8² = 200.96 cm².
3. A circle has radius 12 cm. Using π = 3.14, find its circumference.
75.36 cmCircumference C = 2πr = 2 × 3.14 × 12 = 75.36 cm.
4. A circle has radius 16 cm. Using π = 3.14, find its area.
803.84 cm²Area A = πr² = 3.14 × 16² = 803.84 cm².
5. A circle has radius 16 cm. Using π = 3.14, find its circumference.
100.48 cmCircumference C = 2πr = 2 × 3.14 × 16 = 100.48 cm.
6. A circle has radius 5 cm. Using π = 3.14, find its area.
78.5 cm²Area A = πr² = 3.14 × 5² = 78.5 cm².
7. A circle has radius 18 cm. Using π = 3.14, find its circumference.
113.04 cmCircumference C = 2πr = 2 × 3.14 × 18 = 113.04 cm.
8. A circle has radius 19 cm. Using π = 3.14, find its area.
1133.54 cm²Area A = πr² = 3.14 × 19² = 1133.54 cm².
9. A circle has radius 20 cm. Using π = 3.14, find its circumference.
125.6 cmCircumference C = 2πr = 2 × 3.14 × 20 = 125.6 cm.
10. A circle has radius 7 cm. Using π = 3.14, find its area.
153.86 cm²Area A = πr² = 3.14 × 7² = 153.86 cm².
11. A circle has radius 13 cm. Using π = 3.14, find its circumference.
81.64 cmCircumference C = 2πr = 2 × 3.14 × 13 = 81.64 cm.
12. A circle has radius 3 cm. Using π = 3.14, find its circumference.
18.84 cmCircumference C = 2πr = 2 × 3.14 × 3 = 18.84 cm.
12 questions · Seed 104737 · Age guidance, not curriculum certification