Two pairs of equal length.
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A parallelogram is only a rectangle if it has 4 right angles. A square is a rectangle, but not vice versa because a square has all equal side lengths, four sides, AND four right angles. A rectangle has four right angles and 4 sides.
Parallelogram
It is difficult to give instructions about drawing a figure without knowing what information (side lengths, angle measures, diagonals) you have about it.A parallelogram. And, if all four sides are of the same length, then a rhombus. or a rhombus.It is difficult to give instructions about drawing a figure without knowing what information (side lengths, angle measures, diagonals) you have about it.A parallelogram. And, if all four sides are of the same length, then a rhombus. or a rhombus.It is difficult to give instructions about drawing a figure without knowing what information (side lengths, angle measures, diagonals) you have about it.A parallelogram. And, if all four sides are of the same length, then a rhombus. or a rhombus.It is difficult to give instructions about drawing a figure without knowing what information (side lengths, angle measures, diagonals) you have about it.A parallelogram. And, if all four sides are of the same length, then a rhombus. or a rhombus.
Since both pairs of sides of a parallelogram are congruent, there can only be two or less different side lengths.
If no side lengths are given, then no perimeter is defined.Even if you know all four angles in the parallelogram, it could still be drawn on thehead of a pin or on the floor of the Grand Canyon, with the same angles.But let's look on the bright side: If someone said to you "I have this parallelogram.What is its perimeter ?", then you could pick any number you want out of the blue,and he could not say that you're wrong. A parallelogram could be drawn that hasthe perimeter you gave, and matches all the numbers that he gave.