The word "opposite" is not particularly helpful.
The shape could be:
It could, of course, be a polygon with more than 4 sides.
It has 4 equal sides It has opposite parallel sides It has 2 opposite equal acute angles It has 2 opposite equal obtuse angle It has 2 diagonals that intersect each other at right angles
A parallelogram is such a shape.
a square
Any four-sided shape is a Quadrilateral.This includes squares, rectangles, and the ones with 4 non-equal sides.square: 4 equal sides, 4 equal angles, all 90 degrees, opposite sides parallelrectangle: 4 sides, 4 equal angels, all 90 degrees, opposite sides parallelrhombus: 4 equal sides, opposite angles equal (not all 4) ("diamond" shape)trapezoid: 2 opposite sides parallel, other two sides NOT parallel, angles generally not equal (looks like 2-D pyramid with top chopped off)irregular quadrilateral: the others that don't fit into these categories
No - It has to have two pairs of equal sides. It's a Rectangle without the right angles. A shape with one pair of equal opposite sides and two of other lengths is a Trapezium (trapizod in the US)
A parallelogram is a quadrilateral with opposite sides that are parallel and equal in length, and opposite angles that are equal. Two ways to describe a parallelogram could be as a shape with opposite sides that are both parallel and equal in length, or as a shape with opposite angles that are equal.
It has 4 equal sides It has opposite parallel sides It has 2 opposite equal acute angles It has 2 opposite equal obtuse angle It has 2 diagonals that intersect each other at right angles
A parallelogram is such a shape.
trapizoid
a square
A square
A shape that has 2 pairs of equal sides and no right angles is a kite or a parallelogram. In a parallelogram, each side is equal to the one directly opposite; in a kite, the equal sides are adjacent to one another.
Any four-sided shape is a Quadrilateral.This includes squares, rectangles, and the ones with 4 non-equal sides.square: 4 equal sides, 4 equal angles, all 90 degrees, opposite sides parallelrectangle: 4 sides, 4 equal angels, all 90 degrees, opposite sides parallelrhombus: 4 equal sides, opposite angles equal (not all 4) ("diamond" shape)trapezoid: 2 opposite sides parallel, other two sides NOT parallel, angles generally not equal (looks like 2-D pyramid with top chopped off)irregular quadrilateral: the others that don't fit into these categories
It could be a parallelogram, but there are other shapes with more sides.
It is a quadrilateral shape because it has 4 sides and it has 2 pairs of adjacent sides that are equal with 1 pair of opposite angles being equal and its diagonale are perpendicular.
No - It has to have two pairs of equal sides. It's a Rectangle without the right angles. A shape with one pair of equal opposite sides and two of other lengths is a Trapezium (trapizod in the US)
If a set of equal sides are adjacent, then the quadrilateral is a "kite" shape. If a set of equal sides are opposite, then the quadrilateral is a parallelogram.