Alright, so we can make a right triangle, with the sides being h, sqrt(34), and sqrt (3^2+4^2) due to that we can draw a right triangle with the diagonal of the base. sqrt (3^2+4^2)= sqrt (25)=5. Since sqrt (34) is the hypotenuse, sqrt (34) - 5^2=h^2 = 9, making h =3