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The description given fits that of a right angle triangle
A quadrilateral is the term for a four sided polygon. It is the most general term. It does not imply anything about side lengths or angles being equal nor unequal. Some other answerers have stated that a trapezium (or trapezoid, depending or where you live) fits this description, but it is possible to have two sides (the non parallel sides) to have the same length and still be a trapezoid. But you can have a trapezoid (which only needs 4 sides and 1 pair of parallel sides) that fits the description above (4 sides none of which are equal length).
Someone who co-operates secretly with an enemy occupying force
kg;flk;fdg
The nth term can be anything you like! However, the simplest poynomial that fits these points is given by the rule: Un = n2 + 2 for n = 1, 2, 3, ...