13. Determine the lengths of the remaining sides of the triangle

In the given triangular ruler, $\triangle ABC$ is similar to $\triangle PQR$. If $AB =$ 11 $cm$, $BC =$ 21 $cm$, $QR =$ 7 $cm$, $RP =$ 3 $cm$, then find the remaining lengths of both the triangles.

 

 

1. The length of $CA$ is  $cm$.

 

2. The length of $PQ$ is  $cm$.