Bob is hanging a picture on a wall and wants to center it horizontally. The picture is 28 1/4 inches long and the wall is 154 3/8 inches long. How far from the wall edge should it be?

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.