nicer fraction

mj-msc.tex

@@ -598,7 +598,7 @@ from circle's area formula $A = 2\pi r^2$. Diameter:
 In reverse, adjusted size $A_{adj}$ from half-circle's diameter:
 
 \[
-  A_{adj} = \frac{\pi D^2}{8}
+  A_{adj} = \frac{1}{8} \pi D^2
 \]
 
 \subsection{Definition of a Bend}