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geometry high school spanish introduction secondary angle pairs parallel line transversal theorems congruence introduction to geometry technology conference grammar foreign language travel ratios cosine sin tangent. similarity trigonometry scale factor center of dilation geometry dilations transformations triangle inequalities corresponding sides triangles adjacent angles supplementary angles complementary angles distance formula midpoint segment addition postulate plane points lines viii espanol nativohablantes quijote literatura introduccion ortografía diacritico acento acentos español