BEd lesson plan on triangle for class 9th. A triangle is a polygon with three edges and three vertices. It is one of the basic shapes in geometry. A triangle with vertices A, B, and C is denoted \triangle ABC. In Euclidean geometry, any three points, when non-collinear, determine a unique triangle and simultaneously, a unique plane. so what is the formula of triangle so the area of triangle is
1/2*base*height
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