The formula for area of a trapezoid explained!http://www.youtube.com/watch?v=yTnYRpcZA9c How to Find the area of quadrilaterals How to Find the area of quadrilaterals Parallelogram is a quadrilateral in which both pairs of ...http://math.wonderhowto.com/how-to/find-area-parallelogram-using-geometry-316829/ The area of a parallelogram with given vertices in rectangular coordinates can be calculated using the vector cross product. The area of a parallelogram is equal to ...http://www.ehow.com/how_8622057_area-parallelogram-vertices.html In this lesson, students will use the area formula for rectangles to discover the area formula for parallelograms. As necessary, review the concept of area as well as ...http://illuminations.nctm.org/Lesson.aspx?id=1882 Summary: The dimensions of a rectangle are length and width. Given the length and width of a rectangle, we can find the area. Given the area and one dimension of a ...http://www.mathgoodies.com/lessons/vol1/area_rectangle.html Line Segments Sweeping Out Area; Planimeters work based on the intuitive notion of a moving line segment sweeping out area. Here is a line segment sweeping out a ...http://persweb.wabash.edu/facstaff/footer/Planimeter/HowPlanimetersWork.htm Online/offline tutoring: http://situtoring.net/http://www.youtube.com/watch?v=crm-GS4JIYY Learn how to calculate area of a triangle for a building or remodeling project in this free home improvement video from a remodeling expert.http://www.ehow.com/video_4420316_calculate-area-triangle.html In this particular example, we can salvage the mess by making one more cut, but what if the parallelogram were even longer and skinnier? It turns out that any ...http://thinkmath.edc.org/resource/measurement-discovering-formulas-area Area of Parallelogram: when deriving the area of parallelogram formula from the one for a rectangle one important case is casually omitted. We show that the principle ...http://www.cut-the-knot.org/Curriculum/Geometry/AreaOfParallelogram.shtml You can check the answer by counting how many 1 cm 2 squares there are within the shape. The same formula is used for the area of a square.http://www.liv.ac.uk/~cll/lskills/WN/Numeracyperimeter.tmplt Find the perimeter of the parallelogram. We have a parallelogram right over here, opposite sides are parallel. That side is parallel to that side right over here.https://www.khanacademy.org/math/geometry/basic-geometry/area_non_standard/v/perimeter-of-a-polygon#!