Understand why the formula for the area of a parallelogram is base times height, just like the formula for the area of a rectangle. Watch the next lesson:https://www.khanacademy.org/math/geometry/hs-geo-foundations/hs-geo-area/v/area-of-a-trapezoid-1?utm_source=YT&utm_medium=Desc&utm_campaign=highschoolmath Missed the previous lesson? https://www.khanacademy.org/math/geometry/hs-geo-foundations/hs-geo-area/v/intuition-for-area-of-a-triangle?utm_source=YT&utm_medium=Desc&utm_campaign=highschoolmath High School Math on Khan Academy: Did you realize that the word "algebra" comes from Arabic (just like "algorithm" and "al jazeera" and "Aladdin")? And what is so great about algebra anyway? This tutorial doesn't explore algebra so much as it introduces the history and ideas that underpin it. About Khan Academy: Khan Academy is a nonprofit with a mission to provide a free, world-class education for anyone, anywhere. We believe learners of all ages should have unlimited access to free educ