Answer:
D)
Explanation:
What is an angle?
An angle is a measure of a turn, measured in degrees or °. Angles are made up of two rays, making the sides of the angle.
What is an adjacent angle?
Two angles are adjacent if they share a common vertex and side. In other words, adjacent angles are directly next to each other.
- Looking at the first choice, (∠8 and ∠12) we can see they are not adjacent. They aren't even next to each other.
- Looking at the second choice (∠1 and ∠13) They aren't next to each other either, meaning they are not adjacent.
- The third choice (∠11 and ∠9) is not either because the angles are not next to each other.
- But the last choice (∠6 and ∠5) gives two angles that are not only next to each other, but they share a common vertex and side.
Therefore, D) is the correct answer.