Triangle has side lengths

MATHEMATICS · Subjective · GCSE · Mathematics · Geometry and Measures · Geometry and Measures

Problem

Triangle

ABC

has side lengths

AB = 5\,\text{cm}

BC = 6\,\text{cm}

and

CA = 7\,\text{cm}

. It is given that

\triangle ABC \cong \triangle DEF

and

\triangle DEF \cong \triangle PQR

, with the order of letters showing the correspondence in each congruence statement. Find the length of side

QR