The Center of gravity of regular-shaped uniform objects is their geometrical Center.

• The Center of gravity of a uniform rod is its midpoint. 
• The Center of gravity of a uniform square or rectangular sheet is the point of intersection  of its Diagonals.
• The Center of gravity of a solid or hollow sphere is the Center of the sphere. 
• The Center of gravity of a uniform circular ring is the Center of the ring.
• The Center of gravity of a uniform circular disc is its Center as 
• The Center of gravity of a uniform solid or hollow cylinder is the mid-point on its axis. 
• The Center of gravity of a uniform triangular sheet is the point of intersection of its  medians.