vol.of sphere w/ radius 0.5cm :D
You need to know the height to be able to calculte the volume of a sphere.
The formula is pi*r^2*h/3.
you mean pi*r2* 4/3 not h/3
4/3 pi r^3 r^3 NOT r^2
4/3 pi (.5)^3 = your answer......just use the calculator
+42 
+37146 
