Angle Properties in Triangles

The video tutorial explains that triangles are polygons with three sides and can be classified by their angles into right, obtuse, and acute triangles. It emphasizes that for a shape to be a triangle, it must satisfy all properties of triangles and polygons. The tutorial provides examples of shapes with right and obtuse angles that are not triangles, such as quadrilaterals, and highlights the importance of closed shapes in defining polygons. The lesson concludes with a summary of classifying triangles by their angles.

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