The chord that runs through the middle of a circle is called the diameter.
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all you have to do is find a line with two endpoints on the circle also a diameter is the longest chord on a circle that runs through the middle of the circle.
15 APEX =)
it is an imaginary line which runs through the middle of the globe
Pi is the equivalent of any circle's circumference (the length around the edge of the circle) divided by the same circle's diameter (the length of the line that runs directly through the center of the circle). Pi is always equal to about 3.14.
x2 + y2 = r2 describes a circle, radius r, centred on the origin. r is thus sqrt(25 + 144) ie 13 units.