Parts of a Circle
A line segment that goes from one side of the circle to the center.
Radius
The diameter of a circle is 20 feet. What is the circle's area?
314ft2
The radius of a circle is 6 kilometers. What is the circle's circumference?
37.68km
The lens of a telescope has a diameter of 6 feet. What is the distance around the telescope lense?
18.84 ft
A line that goes from one side of the circle to the other and passes through the center.
Diameter
The radius of a circle is 4 feet. What is the circle's area?
50.24ft2
Lisa has a circular swimming pool. The pool has a diameter of 26 feet. What is the circumference of the pool in feet?
81.64ft
The circular mirror hanging on Neil's wall has a radius of 9 centimeters. How much space did that mirror take up?
254.34cm2
The distance around the circle.
Circumference
The round base of a copper tea kettle has a diameter of 14 centimeters. What is the base's area?
153.86cm2
A circular container has an opening with a radius of 4.2 inches. What is the circumference of the opening?
26.37in
A family room has a circular rug with a radius of 4 feet. How much space does that rug take up?
50.24ft2
Half of the diameter is the what?
Radius
A merry-go-round has a circular platform with a radius of 12 meters. What is the platform's area?
113.04m2
Hugo attaches his A+ test to the refrigerator with a circular magnet. Out of curiosity, he measures the magnet and calculates that it has a diameter of 4 centimeters. What is the magnet's circumference?
12.56cm
Claudia drew a circle on the driveway with chalk. The diameter of that circle was 17 inches. What is the distance around the circle?
53.38in