*in ∆abc, on the extension of the side bc , draw a line segment cd ≅ ca . draw the segment ad . the line segment ce is the angle bisector of ∠acb. the line segment cf is the median towards ad in ∆acd. prove: cf ⊥ ce

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chemists are often responsible for designing a chemical reaction and analyzing the products obtained from it. one significant part of designing a chemical reaction is determining the amount of each reactant that is needed and the amount of each product that will be produced. in order to do so, chemists use stoichiometry, the quantitative relationships between reactants and products.