Remember that a couple of triangles will be congruent if they share one of the next 3 properties:
- SSS, they share their three side lengths
-SAS, share two side lengths and one angle.
-ASA, share two angles and one side length.
Based on these statements I want you to look specifically at the triangles A and D.
-The base of triangle A is made out of 5 units, and its height is 4 units.
-If you look at the triangle D and take as a base its left side, you will realize that it also has 5 units as a base and 4 units as height.
With this information, we can assure that triangles A and D are congruent by SSS.