The second type of geometric figure we will study today is the circle.
A circle is defined as the set of all points that are the same distance from the center. Since the sum of the angles around any given point is 360°, a circle measures 360° around its center.
The radius is the distance from the center to any point
on the circle.
The diameter is a straight line from one point on a circle
to another that passes through the center of the circle. A circle's
diameter is always twice the length of the circle's radius.
In the diagram above, Q is the midpoint, AQ, CQ,
and BQ are all radii, and AQB is a diameter.
A circle is always named after its center. The circle above is
Circle Q.
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