Vertical
Lines that share a common point are called an intersection, or intersecting lines.
Concurrent lines.
Look for any intersecting lines or if they share any same angles to the sides of the triangle.
Lines sharing a common point intercept at that point.
Adjacent means that it is next to something. So, if you two intersecting lines, the angles that are right next to each other or that share a line are called "adjacent"
adjacent angles
They are said to be perpendicular. Or, if you wanted an example of a pair of such lines, one example is a plus sign.
Lines that share a common point are called an intersection, or intersecting lines.
Concurrent lines.
Look for any intersecting lines or if they share any same angles to the sides of the triangle.
Concurrent or intersecting lines.
The angles that share a vertex and a side of a transversal but no interior points are called vertical angles. Vertical angles are formed when two lines intersect, and they are always congruent.
Lines sharing a common point intercept at that point.
Adjacent means that it is next to something. So, if you two intersecting lines, the angles that are right next to each other or that share a line are called "adjacent"
Vertical angles are a pair of non-adjacent angles formed by the intersection of two lines. They are congruent, meaning they have the same measure. In other words, vertical angles are opposite each other when two lines intersect, and their measures are equal.
Adjecent Angles
If they share a ray, then they are basically combined together and since complementary angles add up to 90 degree angles a right angle is formed.