Ineed with problems 12 and 15 shown in the picture below..

An octagonal prism has jow many lateral faces?

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.

What is the best name for the part of the figure identified by the arrow? line of reflection o line of symmetry plane of reflection o axis of symmetry