Hi, could anyone please help me with this formula;

V=1/3 pie r^2h i need to make r the subject i di v-1/3=pier^2h

v-1/3-pie=r^2h

v-1/2-pie-h=r^2 then divide by 2 but i dont think thats realy going to be right and i tried a few others but im gtin into a muddle thnx for any help x