This lesson plan is about congruent triangles for 8th standard mathematics. It aims to enable students to develop the concept of congruent triangles. The teacher will present the definitions and properties of triangles and congruent triangles. Students will then be asked questions to check their understanding and compare different triangles to determine if they are congruent. They will also be shown examples of congruent triangles and asked to identify them. The lesson concludes with students practicing identifying whether two triangles are congruent based on side lengths.