Let the tangent to the parabola \( S: y^{2}=2x \) at the point \( P(2,2) \) meet the \( x \)-axis at \( Q \) and normal at it meet the parabola \( S \) at the point \( R \). Then the area (in sq. units) of the triangle \( PQR \) is equal to:
\( 25 \)
\( \dfrac{15}{2} \)
\( \dfrac{35}{2} \)
\( \dfrac{25}{2} \)
