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1.9: Medición de ángulos
https://espanol.libretexts.org/Educacion_Basica/Geometria/01%3A_Conceptos_b%C3%A1sicos_de_la_geometr%C3%ADa/1.09%3A_Medici%C3%B3n_de_%C3%A1ngulos
When two smaller angles form to make a larger angle, the sum of the measures of the smaller angles will equal the measure of the larger angle. So, the three angles can be labeled, ( $\angle XUY$ or ...When two smaller angles form to make a larger angle, the sum of the measures of the smaller angles will equal the measure of the larger angle. So, the three angles can be labeled, ( $\angle XUY$ or $\angle YUX$ ), $\angle YUZ$ (or $\angle ZUY$ ), and $\angle XUZ$ (or $\angle ZUX$ ). So, $m \angle XUY = 84^{\circ}$ , $m \angle YUZ = 42^{\circ}$ and $m \angle XUZ = 126^{\circ}$ . What is $m \angle LMN$ if $m \angle LMO = 85^{\circ}$ and $m \angle NMO = 53^{\circ}$ ?

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