Example 3: Reasoning about congruency to prove that angles are equal, using SSS triangle congruence.
A geometry proof example showing two triangles, ΔACB and ΔECD, with given information that AE and BD bisect each other at C, and AB = ED. The proof uses SSS congruence to show that ∠A = ∠E, with handwritten steps and reasons in a two-column format.