Angle a is opposite to angle b because they're vertical angles.
What are vertical angles?
It should be noted that vertical angles mean the angle that are opposite each other.
In this case, angle a is opposite to angle b because they're vertical angles. This means they are congruent. In the image of the intersecting roads, angles 'a' and 'b' are opposite, and angles 'c' and 'd' are opposite. Another name for opposite angles is vertical angles because the two angles share the same vertex or corner.
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