(12 points, NO links) In AOPQ, OQ = 38 cm, OP = 29 cm and 20=39º. Find the length of PQ.

a. PQ2=(29)2 + (38)2 + 2(29) (38)cos 39°
b. PQ2=(29)2 - (38)2- 2(29)(38)cos 39°
c. PQ2=(29)2 + (38)2- 2(29)(38)cos 39°
d. PQ2=(29)2 - (38)2 + 2(29)(38)cos 39°

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.