Area Of A Ellipsoid By Radius

Approximation

function Area_Of_A_Ellipsoid_By_Radius(r1,r2,r3 )=  
    4 * PI * pow(((r1*1.6075*r2*1.6075 + r1*1.6075*r3*1.6075
    + r2*1.6075*r3*1.6075)/3),1/1.6075);