We are given that $D$ is the midpoint of $\overline{AC}$, $\angle AED \cong \angle CFD$, and $\angle EDA \cong \angle FDC$. We want to prove that $\triangle AED \cong \triangle CFD$.

GeometryTriangle CongruenceAAS TheoremMidpoint
2025/3/10

1. Problem Description

We are given that DD is the midpoint of AC\overline{AC}, AEDCFD\angle AED \cong \angle CFD, and EDAFDC\angle EDA \cong \angle FDC. We want to prove that AEDCFD\triangle AED \cong \triangle CFD.

2. Solution Steps

We are given that DD is the midpoint of AC\overline{AC}. This implies that AD=CDAD = CD by the definition of a midpoint.
We are also given that AEDCFD\angle AED \cong \angle CFD and EDAFDC\angle EDA \cong \angle FDC.
Therefore, we have two angles and a non-included side congruent. Since we have two angles and the non-included side (AAS theorem) we can show that the triangles are congruent.
Statement | Reason
------- | --------

1. $D$ is the midpoint of $\overline{AC}$, $\angle AED \cong \angle CFD$, $\angle EDA \cong \angle FDC$ | Given

2. $AD = CD$ | Definition of midpoint

3. $\triangle AED \cong \triangle CFD$ | Angle-Angle-Side (AAS) Theorem

3. Final Answer

AEDCFD\triangle AED \cong \triangle CFD

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