Πεψενθε 

`+`(`*`(6, `*`(r))) = h 

`and`(V = `*`(Pi, `*`(`^`(r, 2), `*`(h))), `*`(Pi, `*`(`^`(r, 2), `*`(h))) = `+`(`*`(6, `*`(Pi, `*`(`^`(r, 3)))))) 

`and`(V[1] = `*`(`+`(`*`(`/`(4, 3), `*`(Pi, `*`(`^`(r, 2))))), 3), `*`(`+`(`*`(`/`(4, 3), `*`(Pi, `*`(`^`(r, 2))))), 3) = `+`(`*`(`/`(2, 3), `*`(V))))