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Suma de ángulos internos es igual a : 180.
x + 20 + 2x + x = 180
4x + 20 = 180
4x = 180 - 20
4x = 160
x = 160/4
x = 40
.........................................................
70 = x + x + 20
70 = 2x + 20
70 - 20 = 2x
50 = 2x
25 = x
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3.
30x - 40 = x + x + 20
30x - 40 = 2x + 20
30x - 2x = 20 + 40
28x = 70
x = 70/28
x = 5/2.