Two pairs of equal sides.
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The main difference between a parallelogram and a trapezoid is the number of parallel sides they have: Parallelogram: A quadrilateral with two pairs of parallel sides. Opposite sides are also equal in length, and opposite angles are equal in measure. Rectangles, rhombuses, and squares are all special types of parallelograms. Trapezoid: A quadrilateral with one pair of parallel sides. The other pair of sides are not parallel. In North American English, it's called a trapezoid, while in British English, it's called a trapezium.
A trapezium and a square are both quadrilaterals, but the key difference is the number of parallel sides. A square has two sets of parallel sides and four right angles, while a trapezium has only one set of parallel sides. Parallel sides: A square has two pairs of parallel sides, while a trapezium has only one. Angles: A square has four right angles, while a trapezium can have any combination of angles as long as the interior angles add up to 360°. Side lengths: A square has four equal sides, while a trapezium can have sides of different lengths. Classification: A square is a regular quadrilateral because all its sides and angles are equal. A trapezium is not a parallelogram because only one pair of sides are parallel.
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The 3 names for this figure are: 1. Square - all sides are parallel, there are 4 right angles, and all the sides are the same length. All squares are quadrilaterals and parallelograms. 2. Quadrilateral - 4 sides. NOT all quadrilaterals are squares, however. 3. Parallelogram - all sides are parallel. NOT all parallelograms are squares, however.
A triangle with all equal sides....?