Kevin claims he can draw a trapezoid with 3 right angles. is this possible? explain

This is not possible. Since trapezoids are quadrilaterals, the sum of their angles must add up to 360. If three of the angles are right angles (90 degrees each), then the only possible measurement of the last angle would be 90 degrees, making a fourth right angle. With four right angles, this shape would be a square, not a trapezoid.