Definition: A rhombus is a parallelogram with four equal sides, featuring perpendicular diagonals that bisect each other.

Highlight: Pole rombu can be calculated using either P = a•h or P = (d₁•d₂)/2, where 'h' is height and d₁, d₂ are diagonals.

Example: In a trapezoid, angles adjacent to the same leg sum to 180°: x + β = 180° and β + y = 180°.

Vocabulary: The perpendicular bisector of a line segment is a line that is perpendicular to and passes through the middle of the segment.

Definition: A trapezoid has at least one pair of parallel sides (bases), with its area calculated using P = ½$a+b$•h, where 'a' and 'b' are parallel sides and 'h' is height.

Definition: A quadrilateral is a four-sided polygon with interior angles summing to 360 degrees.

Highlight: Każdy kwadrat jest prostokątem and also a rhombus, combining properties of both shapes.

Example: A square's area can be calculated using P = a² or P = d²/2, where 'a' is the side length and 'd' is the diagonal length.

Vocabulary: Własności prostokąta include right angles at all corners and equal diagonals that bisect each other.

Definition: A parallelogram has two pairs of parallel sides, with diagonals that bisect each other and equal angles at opposite vertices.