Acube with an edge length of 2 inches is painted on all of its sides. then the cube is cut into 8 cubes with an edge length of 1 inch. what percent of the total surface area is painted?

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.