Find the length of the rod, as shown, that will fit inside the cylinder. Give your answer correct to one decimal place. A. 2.4
B. 3.0
C. 1.6
D. 2.9

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.