# Radius of curvature of an offset circle

1. Nov 11, 2008

### sunmath

distance,e from its center. Now the polar equation for the profile
will be e-e*cos(theta)+constant, with theta the angle from reference.
As I understand, the radius of curvature of this curve should be a
constant R. Surprisingly, when I use the polar rad. of curv. eqn. I

For example, if R=2 and e=1. This will give r(@) eqn as 1+(1-1*cos
(@)) I get rad. of curvature varying (cyclic)from approx. 1.8 to 2