Sophia Learning
Sophia: Double Diagonals of a Parallelogram
This lesson cover the concept that that when both diagonals are drawn in on a parallelogram, two pairs of congruent triangles are formed.
Sophia Learning
Sophia: Coordinate Geometry of Parallelograms: Lesson 6
This lesson [7:55] will demonstrate how to use slope, midpoint, and distance formulas to determine from the coordinates of the vertices if a quadrilateral is a parallelogram in a coordinate plane. It is 6 of 6 in the series titled...
Other
Corbettmaths: Names of Quadrilaterals Video 2
Video tutorial discusses 6 types of quadrilaterals: square, rectangle, rhombus, parallelogram, trapezium, and kite. [3:21]
Expansion Learning
Expansion Learning: Shape Basics (Part Three)
Video provides students with an explanation of the basic shapes of hexagon, trapezoid, and parallelogram.