GMAT Problem Solving Question 47: Common right triangles

 
Try the following GMAT Problem Solving question on the properties of right triangles that are commonly tested on the GMAT.

Question 47:

In the figure below, the perimeter of triangle $BDC$ exceeds the perimeter of triangle $ABD$ by how much?

1. $\quad 2\sqrt{3}$

2. $\quad 4$

3. $\quad 3\sqrt{3}$

4. $\quad 6$

5. $\quad 4\sqrt{3}$