Radius is half the length from one side of a circle to the other or half the diameter.
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The Radius is any line draen from the centre of a circle to its circular edge.
triangles don't have radius'
radius = diameter/2
radius = circumference/(2*pi)
# Find the center of the circle # Draw the line of the radius from the center to the circumference # Finish
radius of curvature = 2Focal length