A seesaw on a flat ground as shown in Figure 1 consists of a straight segment 30 units long and a straight support 9 units long located at the exact center of this segment.
As shown in Figure 2, when the left end of the seesaw touches the ground, a shaded region in the shape of a right trapezoid is formed on the right side.
Accordingly, what is the perimeter of this trapezoid in units?\\
A) 54\\
B) 55\\
C) 56\\
D) 57\\
E) 58