The intersection of parallel lines b and c and transversal line d form several special angle relationships, as shown in the image below. Which pairs of angles are vertical angles? Select all that apply.

2 and 3
5 and 8
7 and 2
4 and 5

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.