Circumference of a Circle

circumference - more October 12, 2008 Radius A straight line from the center of a circle to the circumference is a called a radius. When given the radius of a circle, you can find the diameter by using a simple formula.

Name: _____ Radius and Diameter of a Circle Radius and Diameter 1. Which circle has a diameter of 36 km? _____ 2. Which circle has a radius of 16 km?3.

Name: _____ Radius, Diameter, & Circumference The radius of this circle is _____. The diameter of this circle is _____.

Area and Circumference

CHECK YOURSELF 2 Find the circumference of a circle with a radius of 2.5 in. NOTE Because 3.14 is an approximation for pi, we can only say that the circumference is approximately 14.1 ft.

How Many Times Does a Radius Square Fit into the Circle?

radius 7, their answers ranged from 142 to 178 square units for the approximate area of the circle. Dividing such numbers by the square of the radius, that is, 49, we obtain values ranging from 2.9 to 3.6.

According to the rules of trigonometry that you learned so well in school, the radius of a circle is always one-half the diameter . Keep that fact in mind because, in the wire and cable industry, we usually give the minimum bending radius as a multiple of the cable diameter .

Circumference of a Circle

20. Ferris Wheel The original Ferris wheel, designed by George Ferris in 1892 for the World's Columbian Exposition in Chicago, had a radius of 125 feet.

Circumference of a Circle

The radius of a circle is the distance from the center of a circle to any point on the circle. If you place two radii end-to-end in a circle, you would have the same length as one diameter.