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How to Measure Radius Corner Signs
It is important to get accurate measurements of sign cabinets that require replacement faces. Please use the following
procedure to determine the radius of radius corner signs.
To accurately measure a radius you must first determine the
tangent point of the radius. The tangent point is the point at which the curve of the arc meets the straight line of the
rectangle (see Figure 1). On the sign cabinet you will need to find the tangent point visually. (see Figure 2).
Determine the tangent point of the top of the radius. Position a flat piece
of metal, such as a metal ruler against the side of the sign cabinet
and measure the distance from the ruler to the tangent point. This
should give you the outside radius (see Figure 3)
Verify the dimension by reversing the procedure: Determine the tangent point of the side of the radius. Position the metal ruler
against the top of the sign cabinet and measure the distance from the ruler to the tangent point. (see Figure 4)
Repeat procedure on all four corners to assure accuracy of your measurement.


Figure 1 
Figure 2 


Figure 3 
Figure 4 

