# What is Centre of Gravity and Centroid of a Body?

### Centre of gravity

Centre of gravity of a body is defined as the point through
which the whole weight of the body acts. A body can have only one centre of
gravity for all positions of the body. It is represented or denoted by C.G. or
G.

### Centroid

The point, at which the total area of a plane figure (such
as rectangle, triangle, square, quadrilateral, circle etc) is assumed to be
concentrated, is called the centroid of that area. The centroid is also
represented by C.G. or G.The centroid and centre of gravity are at the same point.

#### Centroid or centre of gravity of simple plane figures:

• The C.G. of a uniform rod lies at its middle point.
• The C.G. of a triangle lies at the point where all the three
medians intersect each other.
• The C.G. of a rectangle (or a parallelogram or a square) lies at the
point where its diagonals intersect each other. It is also the point of
intersection of the middle points of the opposite sides.
• The C.G. of a circle lies at its centre.
For better understanding watch below videos #### Pankaj Mishra

Pankaj Mishra is a blogger by passion and Mechanical Engineer by profession. He has completed his B.Tech degree in mechanical engineering in the year 2015. He loves to share his knowledge and help others.