I'm new here. Greetings.
I need to figure out how to calculate the perimeter, or circumference, of an ellipse using the radii, and vice-versa: how to figure out the radii given the perimeter and the ratio of the two radii to each other.
I found an equation for the perimeter, or circumference here: Circumference/Perimeter of an Ellipse: Formula(s) - Numericana)
given the radii x and y, where x>y:
The result will be an approximation but it will be close enough.
Any chance you could help me solve this equation for x in terms of C and y, and then also for y in terms of C and x?
Iím pretty rusty on my equations!
San Francisco, CA