1. If \(ABC\) is a triangle of sides \(AB =\) 25 \(cm\), \(BC =\) 27 \(cm\) and \(CA =\) 32 \(cm\), then find the semi-perimeter.
Semi-perimeter \(=\) \(cm\).
2. If \(ABC\) is a triangle of sides \(AB =\) 11 \(m\), \(BC =\) 15 \(m\) and semi-perimeter \(=\) 20 \(m\), then find the missing side of the triangle.
\(CA =\) \(m\).