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upon itself
Depends on the kite itself. For example, kites in other countries especially, can be in animal and tubular shapes, but in the United States kites are parallelograms.
upon itself
Fold the paper so the line is on itself. Fold this folded edge on itself causing a crease to form that goes through the point in question, You are using the theorem that lines perpendicular to the same line are parallel.
Fold the paper along the line. Fold the paper again so that the first fold is folded onto itself and such that the second fold goes through a specified point - if any. The second fold will represent a line that is perpendicular to the first and which passes through the specified point.