Work Step by Step
We see that only one pair of sides is marked as congruent. However, the triangles have at least one more congruent side, for they share a common side. Also, the straight line at the bottom of the triangle creates a linear pair between the 90 degree angle and the adjacent angle. Since 180-90=90, we see that the adjacent angle is also 90 degrees due to the definition of a linear pair. Thus, the triangles are congruent by SAS.