Question 435401
What is the circumferance of a oval?
<pre>
An oval shape is called an "ellipse".

There is no exact formula for circumference of an ellipse
as there is for the area of an ellipse

{{{drawing(400,250,-11,11,-8,8, arc(0,0,20,-14),
red(line(0,0,10,0),locate(5,0,a)), green(line(0,0,0,7),locate(0.2,3.7,b))



 )}}} 

However, this formula comes pretty close:

{{{C = 2pi*sqrt((red(a)^2+green(b)^2)/2)}}}, but don't take it as exact!

However, the formula for the area of an ellipse is

{{{A=pi*red(a)green(b)}}}, which is exact.

Edwin</pre>