# Geometry for Elementary School/The Side-Angle-Angle congruence theorem

Given two triangles ${\displaystyle \triangle ABC}$ and ${\displaystyle \triangle DEF}$ such that their sides are equal, hence:
1. The angle ${\displaystyle \angle CAB}$ equals ${\displaystyle \angle FDE}$.(they have the same angle ${\displaystyle x}$)
2. The angle ${\displaystyle \angle ABC}$ equals ${\displaystyle \angle DEF}$.(they have the same angle ${\displaystyle z}$)
3. The side ${\displaystyle {\overline {BC}}}$ equals ${\displaystyle {\overline {EF}}}$.(they have the same side ${\displaystyle y}$)