yes they are and they are very big angles.
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No triangle can ever have a reflex angle inside it.
None.
Such a triangle can have any non-reflex angle - subject to the three angles of the triangle adding to 180 degrees.
If you mean the reflex angle is an interior angle of the triangle then no. The sum of the interior angles of a triangle is 180o, which mean all the angles must be less than 180o, but a reflex angle is greater than 180o and so cannot be one of these angles.
The three interior angles of a triangle can only be Acute or Obtuse. However, the external component of these three angles is reflex.