A quadrilateral is a polygon that has four sides, four vertices (corners), and four angles. The sum of the interior angles of any quadrilateral is always 360 degrees. Quadrilaterals can vary widely in shape and properties, including:

• rectangles: squared corners and pairs of equal sides
• squares: squared corners and equal sides
• parallelograms: two sets of parallel sides
• trapezoids: one set of parallel sides
• rhombuses: four equal sides
• kites: two pairs of equal and adjacent sides

Quadrilateral Calculators

• Quadrilateral Area from Sides and Diagonal
• Quadrilateral Area from Sides and Angles
• Quadrilateral Perimeter
• Quadrilateral Semi-Perimeter
• Quadrilateral Volume
• Quadrilateral Weight
• Rectangle Area (A = ω ⋅ h)
• Rectangle Diagonal
• Trapezoid Area: From on top, bottom lengths and separation
• Trapezoid Area from Length of Sides
• Height of a Trapezoid
• Angles of a Trapezoid
• Area of a Kite (or Rhombus)