49. A well in the form of a right circular cylinder is 25 feet deep and 3 feet in diameter. In Figure 1 below, the Sun is shining directly down on the bottom of the well. Later in the day, Earth rotates so that the bottom of the well is just in shadow, creating the right triangle shown in Figure 2 below. Which of the following expressions gives θ ?

A.

B.

C.

D.

E.