The single altitude of a parallelogram is its perpendicular height
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a parallelogram has two pairs of equal angles
A rhombus is a parallelogram with 4 equal sides. Many parallelograms do not have 4 equal sides. All parallelograms have 2 pairs of equal opposite sides.
are the opposite angle of parallelogram equal
A parallelogram has 2 sets of parallel sides. The opposite sides are equal in length and opposite angles are equal. Examples of parallelograms are squares, rectangles and rhombuses. You can find the perimeter of a parallelogram by doubling the base+side length.
draw a quadrangle that has 2 pairs of equal sides but is not a parallelogram