Bernard ate part of a small pizza. He started with 11/12 of a pizza but only ate 2/3 of it. which is the best estimate of the amount Bernard ate

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.