You can't. It is physically impossible as a triangle has 180 degrees, so all it's angles must add up to 180, and a reflex angle is an angle more than 180 degrees, therefore, cannot be done.
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No triangle can ever have a reflex angle inside it.
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.
Types of angles: acute, right angle, obtuse and reflex Types of triangles: equilateral, isoceles, right angle triangle and scalene
Answer Reflex Angle
Such a triangle can have any non-reflex angle - subject to the three angles of the triangle adding to 180 degrees.