Question 493197
x + 2x = 180
3x = 180
x = 60 degrees, one angle.
2x = 120 degrees, the second angle.
This does check.
There are two angles in the relationship.
We can use algebra by making one angle x and the second angle, the supplement, 2x.
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For the last part,
x + x + 20 = 90.
2x + 20 = 90
2x = 70
x = 35
x = 35 degrees, this is one angle.
35 + 20 = 55 degrees, this is the second angle.
35 degrees + 55 degrees = 90 degrees, this does check.
Cleomenius.