# Perimeter of oval

• Nov 18th 2009, 11:34 AM
DarkLightA
Perimeter of oval
Is there a way to calculate the perimeter of an oval with min. diameter 9 cm, and max. diameter 20 cm?
• Nov 18th 2009, 11:41 AM
masters
Quote:

Originally Posted by DarkLightA
Is there a way to calculate the perimeter of an oval with min. diameter 9 cm, and max. diameter 20 cm?

Hi DarkLightA,

The approximate circumference of an ellipse is given by the formula:

$C=2 \pi \sqrt{\frac{1}{2}(a^2+b^2})$

where

a = half of the width diameter (referred to as semimajor axis)
b = half of the length diameter (referred to as semiminor axis)

Found here!
• Nov 19th 2009, 10:40 AM
DarkLightA
Thanks! That's awesome!