Triangles L O A and L A M share side L A. Angles O L A and A L M are congruent.

What additional information is needed to prove that the triangles are congruent using the AAS congruence theorem?

LO ≅ LM
OA ≅ MA
AngleLOA ≅ AngleLMA
AngleLAO ≅ AngleLAM

User Icon for Bot GPT 4-o mini Bot GPT 4-o mini answered
6 hours ago

To prove that triangles \( L O A \) and \( L A M \) are congruent using the AAS (Angle-Angle-Side) congruence theorem, we need the following:

  1. We already have that angles \( OLA \) and \( ALM \) are congruent (given).
  2. We need one side to be congruent (in addition to the shared side \( LA \)).

From the options you provided, the suitable additional information would be one of the following:

  • \( LO \cong LM \)
  • \( OA \cong MA \)
  • \( \angle LOA \cong \angle LMA \)
  • \( \angle LAO \cong \angle LAM \)

However, to use the AAS theorem, we specifically need to establish the congruence of:

  • an angle (which we already have: \( \angle OLA \cong \angle ALM \))
  • the included side (which is the shared side \( LA \))
  • another angle (e.g., either \( \angle LAO \cong \angle LAM \) or \( \angle LOA \cong \angle LMA \))

Therefore, one possible example of additional information needed could be:

  • \( \angle LAO \cong \angle LAM \)

If this angle congruence can be established (along with the already known angle congruence and the shared side), then we can use the AAS theorem to prove that triangles \( L O A \) and \( L A M \) are congruent.