Using pie symbol how can you find 355 as the volume of a cylinder?

Hello,

V=π R²h=355=5*71

1) h=355, R=√ (1/π), V=π * (√ (1/π) ²*355=π/π * 355=355

2) h=5, R=√ (71/π), V=π * (√ (71/π)) ²*5=71*5=355

3) a>0, h=a, R=√ (355 / (πa)), V=π * (√ (355 / (πa))) ²*a=π*355 / (πa) * a=355