选择题
2006 AMC 8 Problem 19: Congruent Triangles
Triangle ABC is an isosceles triangle with AB = BC. Point D is the midpoint of both BC and AE, and CE is 11 units long. Triangle ABD is congruent to triangle ECD. What is the length of BD?
A.
4
B.
4.5
C.
5
D.
5.5
E.
6