If ∠AOB, ∠BOC, and ∠COD are supplementary angles, then what is the value of x and m∠COD?
If angles ∠AOB, ∠BOC, and ∠COD are supplementary angles, then the sum of their measures should be equal to 180 degrees.
Therefore, x + 2x + 3x = 180
6x = 180
x = 30
Since x = 30, the measure of ∠COD is 3x = 3(30) = 90 degrees.