Two.
If four, obviously it is not a kite but a rectangle.
If three, then sum of all four = 360 degrees means the fourth must be 90 degrees as well, so three is impossible.
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It depends on the kite but on most they are
At most two.
Most of the time, rhombuses have no right angles, but a square is also a rhombus, so if it was a sqare, then there would be four right angles, but it will most likely be none.
The most right angles a triangle can possibly have is 1. Any more than that, and it has to be a quadrilateral.
Most likely none.