Measurement jillian measured the distance around a small fishpond as 27 yards which would be a good estimate for the distance across the pond 14 yards 9 yards or 7 yards explain how you decided

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.