Скачать или смотреть A Tiny But Not So Simple Problem - What Is The Unknown Area?

A convex quadrilateral is divided into four parts by its diagonals. Three of the areas are 2, 1, and 3 as shown in the diagram. What is the area of the fourth region?

Thanks to Gerrit for sending me this geometry problem and a solution! You guys have really been sending me a lot of great problems--more to come in following videos!

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