If I have the height and width of an ellipse and the angle from the center. How can I calculate the radius of the ellipse from that angle?

I don’t understand the maths enough to understand how to make this work in Javascript

## Answer

See if this works:

let s = Math.sin(angle) let c = Math.cos(angle) let r = (a*b)/Math.sqrt(a*a*s*s+b*b*c*c)

where `a`

is the horizontal axis, `b`

is the vertical axis, and `angle`

is the, well, angle.