Indicate the method you would use to prove the two 's . if no method applies, enter "none".
sss
sas
asa
aas
none

The simpliest way is to use the AAS Postulate.

AAS Postulate: If two angles and the non-included side of one triangle are equal to the corresponding angles and side of another triangle, the triangles are congruent.

From the diagram you have:

1. one pair of angles with measure 40°;

2. one pair of angles with measure 60°;

3. the non-included side of one triangle is congruent to the non-included side of another triangle (their lengths are 10).

correct choice is D (AAS)