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RS Aggarwal Solutions for Class 7, Chapter 15 are provided in geometry as "Properties of the Triangle". A triangle is a polygon that consists of three sides, three edges, three vertices and the sum of internal angles of a triangle equal to 180°. In the beginning, we start from understanding the shape of triangles, its types and properties, theorems based on it such as Pythagoras theorem, etc. The properties of the triangle are: