The vertices of a regular polygon of sides are joined to form triangles. The number of triangles that do not have their sides as the sides of the polygon is?
Explanation of the correct option:
Total number of triangles formed by sides of a polygon
Total number of triangles formed by sides of a polygon
Total number of triangles with sides as sides of the polygon
Total number of triangles with sides as sides of the polygon
Total number of triangles with sides of the polygon
Therefore total required triangles
Therefore total required triangles
Hence option C is the correct option.