Posted by **Anonymous** on Saturday, January 10, 2009 at 9:10pm.

if i am given the are and the minor ellipse... how do i find the major ellipse?

is there any formula...plz help

- math -
**Damon**, Saturday, January 10, 2009 at 9:20pm
for a circle area = pi r^2

for an ellipse area = pi (minor half length*major half length)

notice that if the major equals the minor, the ellipse is a circle and the formulas are the same.

- math -
**drwls**, Saturday, January 10, 2009 at 9:21pm
I assume you mean the minor and major AXIS of the ellipse.

Let a be half the major axis and b be half the minor axis.

The area of the ellipse is

A = pi*a*b

Since you know A and b, you can solve for a.

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