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Answered 2012-01-11 01:04:52

Squares and rectangles.

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Rectangles have 4 rift angles and some parallelogram doesn't have 4 right angles. Only two parallelogram has 4 right angles , square and rectangle


it is a square, rectangle & some of the parallelogram.


Triangle, paraellogram(srry if i didnt spell that right...), circle


No because it could be a right angled trapezoid. A rectangle must have four right angles. Yes, a parallelogram with a right angle is always a rectangle. In fact, in my geometry book, some 55 years ago such was the definition of rectangle. A parallelogram with one right angle will always have four right angles. The right angled trapezoids that are not rectangles are not parallelograms.


No because it could be an irregular quadrilateral that includes a right angle. A rectangle has four right angles.Yes, a parallelogram with a right angle is always a rectangle. In fact, in my geometry book, some 55 years ago, such was the definition of rectangle.A parallelogram with one right angle will always have four right angles.It is true that you can draw an irregular quadrilateral with a right angle which is not a rectangle but the figure will not be a parallelogram.


which beat describes the angles of some parallelograms


A parallelogram, a rhombus, kites, arrowheads, trapezium and irregular quadrilaterals. However, some kites, arrowheads, trapezium and irregular quadrilaterals can have one (or more) right angles.


Some parallelograms could be quadrilaterals but all parallelograms are polygons


Some paralleograms are rectangles. A right paralleogram is a rectangle. In the case of a rectangle, all angles formed by the sides are right angles and opposite sides are parallel. The sum of adjacent angles in a parallelogram is 180 degrees.


A parallelogram:is a quadrilateral (a four sided polygon)has opposite sides parallel and of equal lengthhas opposite angles equalThe area of a parallelogram is calculated by multiplying one side length by the perpendicular distance between that side and the side parallel to it. A rectangle is a special parallelogram in that all four angles are equal and are right angles (90°).A rhombus is a special parallelogram in that all four sides are of equal length.A square is a special parallelogram in that all four angles are equal (and are right angles) and all four sides are equal in length.


Polygons will be similar if they have the same number of sides AND all of their angles are the same. All of their angles are the same if all but one of their angles are the same because with the same number of sides the angles must add up to the same thing. All squares are similar (4 right angles and sides of equal lenght). All rectangles are similar (4 right angles). We know two triangle are similar if two or mare angles are the same, or if one angle is the same and the two adjacent sides are the same length. Variations of this last proof may apply to some other polygons.


A scalene triangle has no equal sides and one right angle. Other irregular polygons can also fit these criteria.


These shapes are different in some ways:A parallelogram contains two pairs of congruent angles such that they are not adjacent to each other. A rectangle contains all four right angles.The diagonals of both shapes are formed differently from another.A parallelogram has a pair of congruent parallel slanted sides while a rectangle doesn't.


A circle, ellipse, some irregular polygons,


A parallelogram is a quadrilateral that has two pairs of parallel sides. Some parallelograms, such as squares and rectangles have right angles, but most do not. So the answer is a parallelograms that is not a rectangle (square).


Regular and irregular 6 sided hexagons have 6 interior angles that add up to 720 degrees.


This depends to some extent on context.A rhombus is a parallelogram with all sides equal. On this basis a rhombus with 90 degree angles is just a square. Some authorities insist on defining a rhombus as not containing any right angles.


Linear transformation is a function between vector spaces that will always map a parallelogram onto itself. Some examples are rectangles and regular polygons.


No. Because to have an angle you must have adjoining sides.


it has 8 sides,angles,and vertices.Octagons have eight sides. They are also polygons.


Some of them are, but not all of them. A parallelogramis a rectangle only if all of its angles are equal.


Some kites and irregular quadrilaterals. Certainly not a trapezium or parallelogram.


"Quadrilateral" simply means "four sided". Some quadrilaterals do have right angles; squares or rectangles, for example. Some have one or two right angles, but some don't have any right (90 degree) angles.



No, all four angles with in a rectangle are right angles.



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