- #1
tomz
- 35
- 0
Here is the simple question.
When I differentiate the area of a circle, I got the parameter. As the Area is the sum of Circumference.
But why cannot I get the circumference of ellipse by differentiate the area with respect to the radius (I set it as the longer side). The answer I got is 2πa√1-e^2, where e is eccentricity and a is half the longer side.
THank you!
When I differentiate the area of a circle, I got the parameter. As the Area is the sum of Circumference.
But why cannot I get the circumference of ellipse by differentiate the area with respect to the radius (I set it as the longer side). The answer I got is 2πa√1-e^2, where e is eccentricity and a is half the longer side.
THank you!