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the center of the circleThat point is called the "center" of the circle.
A. If the line segment touches two points on the circle it is called as: 1. secant; if the line extends outside the circle. 2. chord; if the line is present only within the circle. B. If the line segment touches one point on the circle AND the center of the circle AND is present only within the circle it is called as: radius.
a circle within a circle within a circle decrealsing in size every time
a hemisphere
semicircleA half circle is called a semicircle.Half a circle is a semi-circle