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(5x + 40) + (3x + 30) + (x + 20) = 180
5x + 40 + 3x + 30 + x + 20 = 180
9x + 90 = 180
9x = 180 - 90
9x = 90
x = 90/9
x = 10
Calculas la medida de los tres para saber cuál es el menor:
5x + 40 = 5(10) + 40 = 50 + 40 = 90
3x + 30 = 3(10) + 30 = 30 + 30 = 60
x + 20 = 10 + 20 = 30
El menor ángulo mide 30°
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