Area and Circumference of a Circle
A Grade 9 math worksheet covering the calculation of area and circumference of circles, including word problems.
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Area and Circumference of a Circle
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Read each question carefully and show your work. Use π ≈ 3.14 for all calculations unless otherwise specified. Round your answers to two decimal places where appropriate.
1. What is the formula for the circumference of a circle?
C = πr²
C = 2πr
C = 2r
C = πd²
2. If the radius of a circle is 5 cm, what is its area?
15.70 cm²
25 cm²
78.50 cm²
31.40 cm²
3. The of a circle is the distance around its edge.
4. The of a circle is the space enclosed within its boundary.
5. The ratio of a circle's circumference to its diameter is represented by the Greek letter .
6. Calculate the circumference of a circle with a diameter of 10 meters.
7. A circular garden has a radius of 7 feet. What is the area of the garden?
8. Doubling the radius of a circle doubles its area.
True
False
9. The diameter of a circle is twice its radius.
True
False
10. A circular swimming pool has a circumference of 31.4 meters. What is the diameter of the pool? What is the area of the pool's surface?
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