Vertices points of intersection of edges of a polyhedron are known as its vertices.

Edges line segments common to intersecting faces of a polyhedron are known as its edges.

Faces polygons forming a polyhedron are known as its faces.

Adjacent vertices the end-points of the same side of a polygon are known as the adjacent vertices.

ADJACENT VERTICES The end-point of the same sides of a polygon are known as the adjacent vertices.

The number of edges of a polyhedron, which has 7 faces and 10 vertices, is

The area of a parallelogram is 12 square units. Two of its vertices are the points A (-1, 3) and B (-2, 4) . Find the other two vertices of the parallelogram, if the point of intersection of diagonals lies on x-axis on its positive side.

Medians the line segments joining the vertices to the mid-points of the opposite side of a triangle are known as its medians.

Find the point of intersection of the medians of a triangle whose vertices are : (-1,0) , (5,-2) and (8,2) .