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Question
- in \\( \triangle qrs \\) shown, \\( \overline{qs} \cong \overline{qr} \\) and point \\( t \\) is located on \\( \overline{rs} \\) such that \\( \overrightarrow{qt} \\) bisects \\( \angle sqr \\). which pair of angles below does not have to be congruent?
(1) \\( \angle qrs \\) and \\( \angle qrs \\)
(2) \\( \angle rqt \\) and \\( \angle qrt \\)
(3) \\( \angle qts \\) and \\( \angle qtr \\)
(4) \\( \angle sqt \\) and \\( \angle rqt \\)
Step 1: Analizar triángulo isósceles
Como \( \overline{QS}\cong\overline{QR}\), \( \triangle QRS\) es isósceles. Entonces \( \angle QSR=\angle QRS\) (ángulos opuestos a lados congruentes).
Step 2: Analizar bisectriz
Como \( \overrightarrow{QT}\) bisecta \( \angle SQR\), \( \angle SQT = \angle RQT\).
Step 3: Analizar triángulos \( \triangle QTS\) y \( \triangle QTR\)
Tenemos \( \overline{QS}\cong\overline{QR}\), \( \angle SQT=\angle RQT\), \( \overline{QT}\cong\overline{QT}\) (lado común). Por el criterio \( SAS\), \( \triangle QTS\cong\triangle QTR\). Entonces \( \angle QTS=\angle QTR\).
Step 4: Analizar \( \angle RQT\) y \( \angle QRT\)
No hay información para asegurar que \( \angle RQT=\angle QRT\).
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(2) \( \angle RQT\) and \( \angle QRT\)