A point (–7, –6) is rotated counterclockwise about the origin to map onto (–6, 7). The angle of rotation is Question 18 options:

A)

180°.

B)

90°.

C)

270°.

D)

360°.

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.