Which of the following statement is/are correct about location of centre of mass ?

Options

A. The centre of mass of three particles of equal weight placed at the vertices of a triangle ABC coincides with the centroid of triangle ABC.
B. A uniform wire is bent to form the sides of a triangle ABC. The centre of mass of wire coincides with centroid of triangle ABC.
C. The centre of mass of four particle of equal weight placed at the vertices of a quadrilateral coincides with centroid of quardilateral.
D. The centre of mass of a body can exist outside the material of the body.

Answer

A, D