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Transcript
MPM 1DI : Unit 9 Geometry Theorems Parallel Lines Theorem (PLT) If two parallel lines are cut by a transversal, the following are true: a) Alternate angles are b) Corresponding angles are c) The co-interior angles on the same equal equal side of the transveral add to 180º a b Angle Sum of a Triangle Theorem (AST) or Interior Angle Theorem (IAT) Exterior Angle Theorem (EAT) A x A + B + C = 180 B z y C Isosceles Triangle Theorem (ITT) Equilateral Triangle Theorem (ETT) Opposite Angle Theorem (OAT) Isosceles Triangle Theorem (ITT) Converse Equilateral Triangle Theorem (ETT) Converse Exterior Angle Sum of a Polygon (EAS) a a d b c c b Supplementary Angles (supp ’s) x y Complimentary Angles (comp ’s) x y