Matt and mindy each built a rectangular prism that has a length of 5 units, a width of 2 units and a height of 4units. matt used cubes that are 1 cm on each side. mindy used cubes that are 1 in on each side. what is the volume of each prism?

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.