FORMULAS FOR MATHCOUNTS
Art of Problem Solving
Introduction & Formulas. The Angle bisector theorem states that given triangle and angle bisector AD, where D is on side BC, then follows that wise, the converse of this theorem holds as well. Further by combining with Stewart's theorem it can be shown that . Proof. By the Law of Sines on and , . First, because is an angle bisector, we know that and thus , so the denominators are equal.
Intermediate Algebra | Online Math Course | AoPS
Intermediate Algebra (Formerly called Algebra 3) Algebraic subjects covered include advanced quadratics, polynomials, conics, general functions, logarithms, clever factorizations and substitutions, systems of equations, sequences and series, symmetric sums, advanced factoring methods, classical inequalities, functional equations, and more.