III 2. A 13-foot ladder leans against a buiding and reaches a window 10 feet above ground. What is the measure of the angle, to the nearest degree that the ladder forms with the ground?
A. 40
c. 50
b 30
d. 56

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.