选择题
2007 AMC 8 Problem 8: Trapezoid Triangle Area
In trapezoid ABCD, AD is perpendicular to DC, AD = AB = 3, and DC = 6. In addition, E is on DC, and BE is parallel to AD. Find the area of triangle BEC.
A.
3
B.
4.5
C.
6
D.
9
E.
18