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====== [[Relation between interior and exterior angles in triangle|Exterior angle theorem:]] Relation between angles formed inside a triangles and angles outside a triangle ======
====== [[Relation between interior and exterior angles in triangle|Exterior angle theorem:]] Relation between angles formed inside a triangles and angles outside a triangle ======
==== Concept 4: Construction of triangles ====
==== Concept 5: Concurrency in triangles ====
==== Concept 5: Concurrency in triangles ====
