Answer:
SSA theorem
Step-by-step explanation:
Given
(a) SSA (b) ASA (c) SAS (d) SSS
Required
Which cannot be used to prove congruence of triangles
In proving the congruence of two or more triangles, the following postulates or theorem are valid and can be used:
ASA, SAS, SSS
The SSA theorem/postulate relies on other postulates and as such, it does not prove congruence on its own.