Determine the Angle Between the Diagonal of a Cube and Its

Multiple Choice

Determine the angle between the diagonal of a cube and its edge, as shown in the fig- ure, where $a = 18$ . Round your answer to one decimal place.

A) $56.7 ^ { \circ }$
B) $57.7 ^ { \circ }$
C) $55.7 ^ { \circ }$
D) $54.7 ^ { \circ }$
E) $587 ^ { \circ }$