Parts of a Circle Worksheet
Identify and understand the different parts of a circle, including radius, diameter, and circumference.
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Parts of a Circle
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Read each question carefully and answer to the best of your ability. Use the diagram to help you identify the parts of the circle.
1. The line segment from the center of a circle to any point on its circumference is called the .
2. A line segment that passes through the center of a circle and has its endpoints on the circumference is called the .
3. The distance around the circle is known as the .
4. If the radius of a circle is 5 cm, what is its diameter?
2.5 cm
5 cm
10 cm
15 cm
5. Which of the following is always twice the length of the radius?
Circumference
Diameter
Area
Arc
6. All radii of the same circle have different lengths.
True
False
7. The diameter is the longest chord in a circle.
True
False
8. Explain the relationship between the radius and the diameter of a circle.