No. in a rhombus the angles are not 90 degrees. also in a parallelogram they are not 90 degrees
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A kite is a quadrilateral so the sum of its interior angles is 360 degrees.
is an exterior angle of a quadrilateral always sometime or never 90 degrees
it's 90 degrees
It is 90 degrees or pi/2 radians.
The sum of the interior angles of a quadrilateral is 360 degrees. If three of the angles are right angles, that is, of 90 degrees each, the the fourth must be 90 degrees. So you can have a quadrilateral with three right angles but its fourth angle will also be a right angle. So exactly 3 right angles is not possible.