Geometry: Common Core (15th Edition)

$\triangle NOE ≅ \triangle SOE$
1. $\overline{OE}$ is congruent to $\overline{OE}$ because they are shared by both triangles. 2. $\overline{NE}$ is marked congruent to $\overline{SE}$. 3. $\overline{NO}$ is marked congruent to $\overline{SO}$. Now, we have three sides on both triangles that are congruent; therefore, we can use the SSS postulate to prove that $\triangle NOE$ is congruent to $\triangle SOE$.