Respuesta :

The supplementary angles => 100 and 80 degree.
Since the interior of a triangle is 180 degree, which means:
80 + 70 + x = 180 => x = 30.
bazanwar03
The value of x is 30 degrees because you can find the degree of the unlabeled angle because the 100 degrees and the unlabeled angle will add up to 180 degrees because a line is equal to 180 degrees. 
180-100=80
All angles in a triangle equal a total of 180 degrees.
x= 180-(70+80)
x= 180-150
x=30

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