Multipy by whatever is there in the following example the * is the dot
(example 6*9=54
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it means it is close
A line that bisects a circle and goes through the center of it is the diameter.
closed figure
An open circle should have a dashed circumference, a closed circle a solid one.
A chord of a circle is a geometric line segment whose endpoints both lie on the circumference of the circle. A secant or a secant line is the line extension of a chord.