What is a system of particles?

Locate the centre of mass of the arrangement shown in the figure. The three rods are identical in mass and length.

Four bodies of masses $2\,kg, 3\,kg, 5\,kg$ and $8\,kg$ are placed at the four corners of a square of side $2\,m$ as shown in the figure. The position of the centre of mass $(CM)$ is:

In the $HCl$ molecule,the separation between the nuclei of the two atoms is about $1.27 \, \mathring{A}$ $(1 \, \mathring{A} = 10^{-10} \, m)$. The approximate location of the centre of mass of the molecule from the hydrogen atom,assuming the chlorine atom to be about $35.5$ times as massive as the hydrogen atom,is ....... $\mathring{A}$.

The centre of mass of a system of two particles of masses $m_1$ and $m_2$ separated by a distance $d$ is:

The coordinates of the center of mass of the triangular lamina shown in the figure are ....... .