The Compendium Geometry is an eBook providing facts, formulas and explanations about geometry. 
Home Analytic Geometry Quadrilateral Trapezoid  
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TrapezoidA trapezoid is a quadrilateral with two sides (a and c) parallel. The central median m is equal to (a+c)/2. The area of the trapezoid can be calculated by A = hm. A trapezoid in which the base angles are equal (and thus with equal sides b and d) is called an isosceles trapezoid. A right trapezoid has two adjacent right angles.


Home Analytic Geometry Quadrilateral Trapezoid 