Area and Circumference of a Circle
Calculate the area and circumference of circles using given radii and diameters. Practice applying formulas for geometric measurement.
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Area and Circumference of a Circle
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Read each question carefully and calculate the area and circumference of the circles. Use π ≈ 3.14. Round your answers to two decimal places where necessary.
1. Find the circumference of a circle with a radius of 7 cm.
2. A circle has a diameter of 15 inches. What is its circumference?
3. Calculate the area of a circle with a radius of 9 meters.
4. What is the area of a circular garden with a diameter of 20 feet?
5. The formula for the circumference of a circle is C = or C = .
6. The formula for the area of a circle is A = .
7. If the radius of a circle is doubled, what happens to its circumference?
It is halved.
It is doubled.
It is quadrupled.
It remains the same.
8. The area of a circle is always a smaller number than its circumference.
True
False
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