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Poly = ‘Many’                 Gon = ‘Angle’

A geometric shape formed by multiple angles or sides is called a polygon. example: Traingle, Rectangle etc. 

Poly = “Many’                Hedron = ‘Face’

A 3 dimensional geometric shape with multiple faces, edges and vertices, in such a way that each vertex connects multiple faces joining, is called a polyhedron. ex: Cube, Cuboid etc

A flat surface which makes boundary of a polyhydron is called the face of the polyhydron.

A vertex is a corner point of a polygon or a polyhedron formed by the intersection of their edges or faces.

A vertex is a corner point of a polygon or a polyhedron formed by the intersection of their edges or faces. 

Plural of vertex is vertices.

A segment that joins the polygon’s center to the midpoint of any side that is perpendicular to that side.

To find the apothem, In a regular polygon, divide the length of one side by 2 times the tangent of 180 degrees divided by the number of sides.

In a 2 dimensional figure, the surface occupied by the polygon is called its area. 

To calculate area of a regular polygon: 

A = 0.5 x perimeter x length of Apothem

The surface area of a polyhedron is the sum of the area of all of its faces. 

S.A = Σ (area of all faces of the polygon)

Said another way, the surface area is the total area covered by the net of a polyhedron

Volume is the space enclosed by the boundary occupied by the 3-dimensional shape