How to find the area of a trapezium. This video talks through three examples of finding the area of a trapezium. One of the examples shows how to find a missing length algebraically if we know the area. To find the area we add the length of the parallel sides, multiply by the perpendicular height and then divide by 2.

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Introduction to Reaction Mechanisms . Addition reaction to an alkene. Created by Sal Khan. Watch the next lesson: https://www.khanacademy.org/science/organic-chemistry/alkenes-alkynes/alkene-reactions/v/markovnikov-s-rule-and-carbocations?utm_source=YT&utm_medium=Desc&utm_campaign=organicchemistry Missed the previous lesson? https://www.khanacademy.org/science/organic-chemistry/alkenes-alkynes/naming-alkenes/v/entgegen-zusammen-naming-scheme-for-alkenes-examples?utm_source=YT&utm_medium=Desc&utm_campaign=organicchemistry Organic Chemistry on Khan Academy: Carbon can form covalent bonds with itself and other elements to create a mind-boggling array of structures. In organic chemistry, we will learn about the reactions…

The definition of a subgroup is given, along with a few examples.

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