The set points whose distance from the center of the circle that is less than the radius.
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inscribed angle
The three parts are:the interior of the circle, the points on the circle (points on its circumference) the outside of the circle.
A sector
Sector.
The length of the perimeter is the circumference. The perimeter itself is the boundary between the interior and exterior of the circle. The perimeter of a circle is called the circumference