"Area and Circumference of Ellipse
'<hr /><div style="max-width:110mm;"><img style="height:65pt;" class="side" alt="ellipse.png" src="https://calcpad.eu/media/math/area/ellipse.png"></div>
'Dimensions
a = ?','b = ?
'Area
A = π*a*b/4
'Circumference
'Assume -'h = (a-b)^2/(a+b)^2
'Using the Ramanujan equation
P = π*(a+b)/2*(1 + 3*h/(10 + sqr(4 - 3*h)))
'Using series (up to the 4-th member)
P = π*(a+b)/2*(1 + 1/4*h + 1/64*h^2 + 1/256*h^3)
'2	1