it means it is close
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A line that bisects a circle and goes through the center of it is the diameter.
Multipy by whatever is there in the following example the * is the dot (example 6*9=54
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.
The length of the edge of a circle.
180o is basically a straight angle, if 360 was a circle 180 wiuld be a half circle