ผลต่างระหว่างรุ่นของ "คุยกับผู้ใช้:พ.น.บุญรอด/ทดสอบ"

 

==Characteristics and properties==

 

If sides AD and BC are ''also'' parallel, then the trapezoid is also a [[parallelogram]]. Otherwise, the other two opposite sides may be extended until they meet at a point, forming a [[triangle (geometry)|triangle]] containing the trapezoid.