A quadrilateral is 4 sided shape. There are 6 main quadrilaterals: *Trapezium *Parallelogram *Rhombus *Kite *Square (type of rectangle) *Oblong (type of rectangle) Therefore, an oblong is one of the quadrilaterals. More specifically, an oblong is the traditional 'rectangle' in which the two sets of parallel lines are unequal. The term 'rectangle' refers to a quadrilateral with 4 right angles, hence a square is one too, but one with equal sides.
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An oblong is a rectangle. However, an oblong is not a square. Both are rectangles because they both have 4 right angles, but a square is equal-sided and an oblong isn't.
A triangle is not a quadrilateral, but a parallelogram and trapezoid are.
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A quadrilateral is a polygon with four 'sides' . A parallelogram is a quadrilateral with two sets of parallel sides.
The fourth side!