Curvature is defined as the reciprocal of the radius (1/radius), in current model units. By default, the greatest curvature value displayed is 1.0000, and the smallest value is 0.0010.
This means larger the radius lesser will be the curvature of the face, & Smaller the radius larger is the curvaure.
As the radius of curvature increases, the curvature value decreases. A planar surface has a curvature value of zero because the radii of flat faces are infinite.
This is very helpful in evaluation of surfaces/faces curvature and radius of curvature.

Step 1:
Start SolidWorks and open the file attached.

Step 2:
Under Evaluate tab click Curvature.

Step 3:
Now click on the surface to see the radius of curvature. As we can see that the radius of curvature is 24.239 so the reciprocal radius i.e. curvature is 0.0411. The green color shows less radius of curvature and blue area shows high radius of curvature.

Step 4:
Repeat the same step for other point and we can note the value of the curvature.
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