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If all four sides are equal, it must be a rhombus, which is a parallelogram. The square is a special case of a rhombus.
A parallelogram is defined as a four-sided shape, with opposite sides of equal length and opposite angles equal.
Yes, opposite angles in a parallelogram must be equal.
No. A parallelogram has two pairs of opposite angles that are equal but to be equiangular, all four angles must be the same. That is not necessarily the case in a parallelogram.
Yes, a rectangle can be a parallelogram. A rectangle is a type of parallelogram with all angles equal to 90 degrees. Additionally, opposite sides of a rectangle are equal in length. Therefore, all rectangles meet the definition of a parallelogram, but not all parallelograms are rectangles.