A Water tank is in the shape of a right circular cylinder with a diameter of 20 feet and volume of 320pi cubic ft.. What is the height, in feet of the water tank?

The pyraminx is a rubik's cube-type toy in the shape of a tetrahedron. the pyraminx shown below has edges 15\,\text{cm}15cm long and vertical height h=12.2\,\text{cm}h=12.2cm. the triangle drawn with dashed lines is a right triangle. what is the distance rr? round your answer to the nearest tenth.