I draw a circle on a paper and cut a sector of it to make a cone with it.
then I draw an ellipse on the cone. then I netted the cone to have its circular sector again.
the ellipse's perimeter was like what you see in the picture (I have lost it so I draw a similar thing in Microsoft Paint).
how to find ellipse's perimeter, semi-major and semi-minor axes using it?
please don't tell me find the perimeter with a tool. I want a way.