Straight lines AB CD and EF intersect at point O.

univerkov | June 17, 2021 | education

Angle EOF is a flat angle that has a magnitude of 180.

Then the angle AOD = (AOF – AOE – DOF) = (180 – 40 – 80) = 180 – 120 = 60.

Angles AOD and COB are vertical angles formed by the intersection of straight lines AB and CD.

Then the angle COB = AOD = 60.

Answer: The value of the COB angle is 60.

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