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Hello! In this video, we pose an equation by establishing the relationship that exists between the three given angles of the triangle. One of them is an exterior angle and as such, its measurement is equal to the sum of the two interior angles of the triangle that are not adjacent to it. Then the equality is posed, the unknown x or y is cleared to know its value. Then, it is replaced in the data of each interior angle and knowing its measurements, the other missing interior angle can be calculated. Any questions or suggestions for a topic to upload are welcome!