the side of an angle measurement
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The two sides in a right triangle that form the right angle.
A right triangle, by definition, has a right (or 90o) angle. The side that is opposite that right angle is the hypotenuse. That is to say, the other two sides, which are not the hypotenuse, are the two sides which meet at a right angle.
A polygon is a closed plane figure bounded by straight sides. Since it is a closed surface, it has an interior (inside) and an exterior (outside). The interior angle of a polygon is the angle formed by two adjacent sides such that the angle is facing the interior of the polygon.
There is no formal definition: it is any side of a triangle. Often, if the triangle has a horizontal base, then it is one of the sloped sides. In a right angled triangle, it is one of sides adjacent to the right angle. In an isosceles triangle, it is one of the equal sides.
A trapezoid is a quadrilateral that has one pair of parallel sides. Since a right angle is formed by two perpendicular lines, it would mean that one of the non-parallel sides would have to be perpendicular to one of the parallel sides, which violates the definition of a trapezoid. Therefore, a trapezoid cannot have a right angle.