bugfix

1 files changed, 2 insertions, 2 deletions

diff --git a/index.html b/index.html
index 1303744..a6fdeb0 100644
--- a/index.html
+++ b/index.html
@@ -227,8 +227,8 @@
 			r = document.getElementById('r' + id).value.replace(",", ".");
 
 			f = ( Math.PI * Math.pow((d/2),2) );
-			fr = ( Math.PI * Math.pow((d-r)/2,2) );
-			frpp = (( Math.PI * Math.pow((d)/2,2) ) - ( Math.PI * Math.pow((d-r)/2,2) ));
+			fr = ( Math.PI * Math.pow((d/2)-r,2) );
+			frpp = (( Math.PI * Math.pow((d)/2,2) ) - ( Math.PI * Math.pow((d/2)-r,2) ));
 			v = fr / frpp;
 			fp = f / p;
 			frp = fr / p;