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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.
Yes, if it is an equiangular or equiangular and equilateral parallelogram (rectangle or square).
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.
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The single altitude of a parallelogram is its perpendicular height
None normally
Octagons have no perpendicular lines.
A parallelogram with perpendicular sides is called a rectangle.