m∠COB and m∠BOA are equal.
What are angles?
An angle is a figure in Euclidean geometry made up of two rays that share a common terminal and are referred to as the angle's sides and vertices, respectively. Angles created by two rays are in the plane where the rays are located. The meeting of two planes also creates angles. We refer to these as dihedral angles.
Given ∠COB = 80 - 60 = 20
∠BOA = 60 - 40 = 20
Therefore, m∠COB and m∠BOA are equal.
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