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.
15 squared is 225 then you subtract the square of 12.2: 148.84, then after you find that out, you find the square root of 76.16 since that's what the answer of 15 squared minus 12.2 squared, and the answer is 8.7
