Which of the following statements can be made about the parallelogram shown below? note that the figure is not drawn to scale.

a. it is a rhombus
b. it is a rectangle
c. it is a square
d. it is neither a rhombus, a rectangle, nor a square

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.