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What is a vertical angle?

  1. An angle that measures less than 90 degrees

  2. An angle formed by the intersection of two straight lines and is NOT equal to its opposite angle

  3. An angle that measures exactly 180 degrees

  4. Two equal and opposite angles formed by the intersection of two straight lines

The correct answer is: Two equal and opposite angles formed by the intersection of two straight lines

A vertical angle is an angle formed when two straight lines intersect. It is important to note that the two angles formed are equal and opposite to each other. This makes option D the correct answer. Option A is referring to acute angles, which are angles that measure less than 90 degrees, and is not a vertical angle. Option B is referring to an alternate angle, which is equal to the vertical angle but is not opposite to it. Option C is referring to a straight angle, which is equal to 180 degrees but is not a vertical angle.