Geometrical constructions — practice question

For triangle $ABC$, the lengths are $AB = 7\text{ cm}$, $BC = 4\text{ cm}$ and $AC = 6\text{ cm}$. With only a ruler and compasses, construct triangle $ABC$. The side $BC$ has already been provided. The diagram shows a vertical line with $B$ at the top and $C$ at the bottom.