The relation between the two angles ∠a and ∠b is that they are complementary angles. The correct option is B.
What are complementary angles?
The angles when added give the sum of 90 degrees and are called complementary angles. The angle is defined as the span between two intersecting lines or surfaces at or close to the point where they meet.
In the given figure it is observed that the two angles ∠a and ∠b when added give 90 degrees.
Therefore, the relation between the two angles ∠a and ∠b is that they are complementary angles. The correct option is B.
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