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### 6 Cards in this Set

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 Use this theorem for the following proof: Given: △ ABC Prove: angle A + angle B+ angle C = 180 The sum of the measures of the three angles of a triangle is 180. Definition of an Exterior Angle of a polygon An ext. angle of a polygon is an angle that is adjecent to and supplementary to an interior angle of the polygon. Theorem to solve Given △ DEF w/ ext angle 1 @ F Prove: m angle 1 = m angle D+ m of angle E refer to p. 296 for diagream The measurement of an exterior angle of a triangle is equal to the sum of the measures of the remote interior angles Midline Theorem A segment joining the midpoints of two sides of a triangle is parallel to the third side, and its length is one-half the length of the third side. p. 296 No-choice theorem If two angles of one triangle are congruent to two angles of a second triangle, then the third angles are congruent. AAS theorem If there exists a correspondence between vertices of two triangles such that two angles and a nonincluded side of one are congruent to the corresponding parts of the other, then the triangle are congruent.