http://www.mathgoodies.com/lessons/vol1/area_parallelogram.html

 

https://www.khanacademy.org/math/geometry/basic-geometry/area_non_standard/v/area-of-a-parallelogram

 

https://www.khanacademy.org/math/geometry/basic-geometry/area_non_standard/e/area_of_parallelograms

 

http://www.xpmath.com/forums/arcade.php?do=play&gameid=11

 

https://www.studyladder.com/games/activity/area-of-parallelograms-13140

 

 

http://www.mathgoodies.com/lessons/vol1/area_triangle.html

 

https://www.studyladder.com/games/activity/area-of-triangles-13135