The length of the shorter side of a rectangle is 2 units. The length of each
diagonal is 4 units. What is the acute angle between the diagonals?
Pick:  A) 15o  B) 22.5o  C) 45o  D) 60o  E) 75o
Suppose the vertices of the rectangle are labeled A, B, C, and D in such a way   that AB is the shorter side. Let O be the intersection point of the two diagonals. Then   4AOB is equilateral   correct answer 60o
<result>D</result>
The length of the shorter side of a rectangle is 2 units. The length of each
diagonal is 4 units. What is the acute angle between the diagonals?