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no it does not
no it does not
Yes, if it is an equiangular or equiangular and equilateral parallelogram (rectangle or square).
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no it does not
no it does not
A parallelogram has 2 pairs of parallel lines and in the form of a rectangle it has 2 pairs of parallel lines and 4 perpendicular lines that meet at each of its corners at right angles.
They are what makes it a rectangle. The rectangle is a special kind of parallelogram. The perpendicular lines cause it to be called a rectangle.
It may have either none, or four. If the angles are ninety degrees, then we have a rectangle, which is a special case of a parallelogram, and each side is perpendicular to the next. For any other set of angles, no sides are perpendicular.
Yes, if it is an equiangular or equiangular and equilateral parallelogram (rectangle or square).
The single altitude of a parallelogram is its perpendicular height
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None normally
Octagons have no perpendicular lines.
A parallelogram with perpendicular sides is called a rectangle.