Do each exercise. round your answer as indicated and find it in the appropriate answer column. notice the word under the answer. write this word in the box containing the letter of the excercise

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.