Radius, diameter, and circumference and area of Circles
A circle is a plane round figure in which all points are equidistant from the center.
Radius is a line segment that joins the center of circle to any point on the circumference of circle.
Diameter is a straight line segment passing through the center of circle, the endpoints of which touches the circumference of circle.
Circumference of circle is the distance around the circle.
Circumference of circle = 2π× radius = π× diameter
Area of circle = π× (radius)2
Example:What is the radius of circle with diameter 12 inches?
Radius of circle = = = 6 inches
Example:If the circumference of circle is 88 cm, then what is the radius of circle? (Use π= )
2πr = 88
2 ××r = 88 implies r = 14 cm
- What is the radius of circle with circumference 24π in?
- What is the area of circle with circumference 30.2 yards? Round your answer to the nearest tenth. (Use π = 3.14)
- What is the area of circle with diameter 6 yards? Round your answer to the nearest tenth. (Use π = 3.14)
- What is the diameter of circle with circumference 63 feet? Round your answer to the nearest whole. (Use π = 3.14)
- What is the circumference of circle with area 12.6 in2? Round your answer to the nearest tenth. (Use π = 3.14)
- 12 in.
- 6 yd2
- 3 yd2
- 20 feet
- 6 in
Download/Solve a Worksheet for Radius, Diameter, Circumference and Area of Circles
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