\(\dfrac{{{V_{S.A'B'C'}}}}{{{V_{S.ABC}}}} = \dfrac{{SA'}}{{SA}} + \dfrac{{SB'}}{{SB}} + \dfrac{{SC'}}{{SC}}\)          

\(\dfrac{{{V_{S.ABC}}}}{{{V_{S.A'B'C'}}}} = \dfrac{{SA'}}{{SA}}.\dfrac{{SB'}}{{SB}}.\dfrac{{SC'}}{{SC}}\)

\(\dfrac{{{V_{S.A'B'C'}}}}{{{V_{S.ABC}}}} = \dfrac{{SA'}}{{SA}} = \dfrac{{SB'}}{{SB}} = \dfrac{{SC'}}{{SC}}\)         

\(\dfrac{{{V_{S.A'B'C'}}}}{{{V_{S.ABC}}}} = \dfrac{{SA'}}{{SA}}.\dfrac{{SB'}}{{SB}}.\dfrac{{SC'}}{{SC}}\)