Yes, they do.
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In math, are squares are rectangles but not all rectangles are squares. Also rectangle have two sets of even sides and two sets of un-even sides. But all square sides are equal.
No. Parallelograms have only 4 sides with 2 sets of parallel sides: they include squares, rectangles, and rhombuses (rhombi, diamond shapes). Because opposite angles are equal, each pair of parallel sides is equal in length. (For squares and "equilateral rhombi" all four sides are equal in length.)
Yes, a square has two sets of parallel sides. Each pair of opposite sides is equal in length and runs parallel to each other. This property is what categorizes squares as a type of rectangle and a type of parallelogram. All angles in a square are right angles, further confirming its symmetrical properties.
There's an infinite list of 3-number sets that can be the lengths of the sides of aright triangle. The only fact that's true of all of them is:(square of the length of the longest side) = (sum of the squares of the lengths of the other two sides.)
All squares have TWO SETS of opposite, parallel sides. A square is a parallelogram with 4 equal sides and 4 equal angles (right angles) of which adjacent sides are perpendicular. The related parallelogram, the rhombus, or "diamond" shape, also has 4 equal sides, but no right angles, where opposite angles are equal and adjacent angles are supplementary (sum to 180 degrees).