Construye un triángulo Isósceles A, B, C, (no equilátero)[br][br]Una vez construido, selecciona la herramienta Angulo [img]data:image/png;base64,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[/img], y haz clic dentro del triángulo, observa que dos de los ángulos son iguales. [br][br]Mueve los puntos A, B, C y comprueba que siempre es así.