Forces and equilibrium — practice question

A particle $P$ with mass $1.05\,\text{kg}$ is attached to one end of each of two light inextensible strings, whose lengths are $2.6\,\text{m}$ and $1.25\,\text{m}$. The opposite ends of the strings are fixed to points $A$ and $B$, which lie at the same horizontal level. $P$ is held in equilibrium at a point $1\,\text{m}$ below the level of $A$ and $B$ (see diagram).