Diameter runs straight across. Radius only goes half way, to the center.
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Radius
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.
This is a straight line, runs through the origin and has a slope of 12.
Five types of lines are: Horizontal - A line that runs from left to right in a straight line vertical - A line that runs from top to bottom in a straight line Perpendicular - When two straight lines intersect (i.e.cross) each other at right angles (= 90°) Parallel - When two lines never meet each other, no matter how much you extend them Intersecting - When two or more lines meet or cross
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.