All quadrilaterals except parallelogramshave less than 2 pairs of parallel sides.
A rhombus has two opposing acute angles (less than 90º) and two opposing obtuse (greater than 90º) angles, with the opposing sides being parallel and the sides being of equal length. A parallelogram can have the two acute angles and two obtuse angles, but have sides of different lengths. That is: two opposing sides shorter than the other two opposing sides. All angles total 360º
More or less the same as a square. 4 right angles (90 degrees) 2 pairs of parallel lines.If you can guarantee that the opposite sides of your 4-sided figure are parallel,OR that they're equal, AND that the figure has one right angle inside it, thenyou can be sure that it's a rectangle.
A hexagon or any of a selection of polyhedrons with 10 or more sides. I am not sure that less than 10 sides will suffice but they may well do.
The (equal) sides of an isosceles triangle (drawn with the base on the bottom) cannot be parallel. They must intersect at the top with an included angle greater than zero and less than 180 degrees.
A trapezoid has only 1 pair of parallel sides of different lengths
All quadrilaterals except parallelogramshave less than 2 pairs of parallel sides.
Alright, honey, you've got yourself a trapezoid. It's got two acute angles and two obtuse angles, two pairs of parallel sides, and two pairs of equal sides. It's like the Beyoncé of quadrilaterals - fierce and fabulous.
Not exactly. A trapezoid has exactly one pair of parallel sides -- no more and no less.
A rhombus has two opposing acute angles (less than 90º) and two opposing obtuse (greater than 90º) angles, with the opposing sides being parallel and the sides being of equal length. A parallelogram can have the two acute angles and two obtuse angles, but have sides of different lengths. That is: two opposing sides shorter than the other two opposing sides. All angles total 360º
More or less the same as a square. 4 right angles (90 degrees) 2 pairs of parallel lines.If you can guarantee that the opposite sides of your 4-sided figure are parallel,OR that they're equal, AND that the figure has one right angle inside it, thenyou can be sure that it's a rectangle.
A triangle having all angles less than 90 degrees is a polygon having no parallel sides and all acute angles.
This is a parallelogram. The first requirement is 2 pairs of congruent sides where the congruent sides are not adjacent. This is like a rectangle (excluding a square) that has two pairs of congruent sides where the congruent sides are not adjacent. But the angles are not all congruent (as set in the question) which pushes the shape into the "next less regular" shape, the parallelogram. The angles will not all be congruent, but it will have 2 pairs of congruent angles. There is no way to avoid the 2 pairs of congruent angles because of the requirement that the shape must have 2 pairs of congruent sides (the first requirement).
A hexagon or any of a selection of polyhedrons with 10 or more sides. I am not sure that less than 10 sides will suffice but they may well do.
The (equal) sides of an isosceles triangle (drawn with the base on the bottom) cannot be parallel. They must intersect at the top with an included angle greater than zero and less than 180 degrees.
none. A triangle, in standard 2 dimensions cannot have any parallel sides. Let's show without going into formal proof. Let's say that you try to make a triangle with 2 parallel sides. -------------side a------------- |C | | |side b | | |A -------------side c--------------- Side a & b intersect at vertex C. Side b & c intersect at vertex A, and since sides a & c are parallel, they will never intersect, so there is no third vertex, so it's not a polygon, much less a triangle.
dude its called a TRAPAZOID didnt u learn that in math? Crystal