Area and Circumference of a Circle
A Grade 8 math worksheet focusing on calculating the area and circumference of circles using given radii or diameters.
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Area and Circumference of a Circle
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Read each question carefully and calculate the area and/or circumference of the circles. Use π ≈ 3.14 and round your answers to two decimal places where necessary.
1. Find the circumference of a circle with a radius of 7 cm.
2. Calculate the circumference of a circle with a diameter of 15 inches.
3. What is the area of a circle with a radius of 9 meters?
4. A circular pond has a diameter of 20 feet. Find its area.
5. The distance around a circle is called its .
6. The formula for the area of a circle is A = .
7. If the diameter of a circle is 10 cm, its radius is cm.
8. Which of the following is the correct formula for the circumference of a circle?
C = πr²
C = 2πr
C = πd²
C = 2r
9. A circular garden has a circumference of 31.4 feet. What is its radius and area?