选择题
2000 AMC 8 Problem 15: Nested Equilateral Triangles
Triangles ABC, ADE, and EFG are all equilateral. Points D and G are midpoints of AC and AE, respectively. If AB = 4, what is the perimeter of figure ABCDEFG?
A.
12
B.
13
C.
15
D.
18
E.
21