Lydia and Michelle each went for a haircut. They want to donate the length they cut off to make wigs. Together, they have 3 feet of hair to donate. How many inches of hair did each girl donate? explain your thinking and solution

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.