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you take the center of a circle draw a straight line up ( radius ) and make it a 45 degrees by drawing another line forming
In a drawing, a centre line is used to show the centre of a part.
a chord is a line between two points on the circle the radius is a line from the center to the circle
Radius
Radius is half the diameter. The diameter of a circle is a straight line that passes from one side of the circle to the other through the centre of the circle. Half of that line is the radius.