May 2018
Beginner
490 pages
13h 16m
English
The radius is the distance between the center of a circle and its circumference, as shown in the following diagram:

The radius of a circle is half of the circle's diameter. The relation between the radius r and the circumference C is (where π=3.14):

If the length of the radius is wrapped around the circumference of a circle, that arc forms a radian, as shown in the following diagram:

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