# Complementary angles

On the screen, we can see two angles AOB and A'O'B' . We can change the value of angle AOB using its slide bar. Notice, when we change the value of angle AOB then angle A'O'B' automatically changes. Let us move the slide bar and observe what is the relation between angles AOB and A'O'B'

1. What is the relation between the angles AOB and A'O'B'?

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