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Course: Class 9 Math (India) - Hindi > Unit 6
Lesson 4: Proofs: TrianglesProofs concerning isosceles triangles (Hindi)
Anmol proves that the base angles in isosceles triangles are congruent, and conversely, that triangles with congruent base angles are isosceles. He also proves that the perpendicular to the base of an isosceles triangle bisects it.