Find the value of the linear correlation coefficient r. Cost=9,2,3,4,2,5,9,10 number=85,52,55,68,67,86,83,73

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.