1. The problem is about expressing the congruence of two triangles using notation. 2. The congruence of two triangles means they have the same size and shape, with corresponding sides and angles equal. 3. The standard notation for congruent triangles is $\triangle ABC \cong \triangle XYZ$, which reads as "triangle ABC is congruent to triangle XYZ". 4. The symbol $\cong$ is used to denote congruence, not multiplication or any other operation. 5. Therefore, to express that triangle MNP is congruent to triangle GHJ, you type: $$\triangle MNP \cong \triangle GHJ$$ 6. Similarly, for triangles ABC and XYZ, you type: $$\triangle ABC \cong \triangle XYZ$$ 7. Do not use multiplication symbols or dots between triangle symbols; use the congruence symbol $\cong$ instead. This is the correct way to write triangle congruence statements.