Perimeter formula for ellipse was shown to be in error by Kepler, more than 400 years ago; try Ramanujan 1, a simple formula only little more than a 100 years old.
I think all the questions asked are important to the app, and it must be introduce in it
Sooper... App.. It is very use full App for us
A clever app that calculates the area, volume & weight of many different shapes.
Metal app calculate volume,weight,area for many shapes,metals and 400 materials.