PARALLEL LINES IN MATH ILLUSTRATIONS HOW TO
I also show how to draw a line perpendicular to a given line through a point on the line, or through a point not on the line.
In the video below, I show you how to a right angle (or a perpendicular line to a given line) using either a protractor or a triangular ruler. How to draw a right angle (perpendicular line) and a rectangle Which line segments in these figures are parallel? Which are perpendicular? a.Īre _. Parallel? Continue the lines with your ruler.Ģ. What about these lines? Do they intersect or are they We say two lines or line segments are perpendicular if they form a right angleġ. Much you would continue them to both directions. Think of the parallel lines as never meeting each other, no matter how Two lines or line segments can either intersect (cross) each other or be The lesson also includes a video where I show how to draw a perpendicular line and a rectangle using a protractor or a triangular ruler. Two lines cut by a transversal line are parallel when the alternate exterior angles are equal.Īlternate exterior angles are a pair of angles found on the outer side but are lying opposite each other.Ĥ.This lesson explains what are parallel and perpendicular lines and has varied exercises for the students. Two lines cut by a transversal line are parallel when the alternate interior angles are equal.Īlternate interior angles are a pair of angles found in the inner side but are lying opposite each other.ģ.
In general, they are angles that are in relative positions and lying along the same side.Ģ. The two pairs of angles shown above are examples of corresponding angles. Two lines cut by a transversal line are parallel when the corresponding angles are equal.
When a transversal line cuts two lines, the properties below will help us determine whether the lines are parallel.ġ. In the next section, you’ll learn what the following angles are and their properties: These different types of angles are used to prove whether two lines are parallel to each other. When a transversal line cuts a pair of parallel lines, different pairs of angles are formed. The image shown to the right shows how a transversal line cuts a pair of parallel lines. Transversal lines are lines that cross two or more lines. Several geometric relationships can be used to prove that two lines are parallel.īefore we begin, let’s review the definition of transversal lines. We’ll learn more about this in coordinate geometry, but for now, let’s focus on the parallel lines’ properties and using them to solve problems. The slopes of two parallel lines are equal in coordinate geometry.When the graphs of two linear equations are parallel in coordinate geometry, the two equations do not share a solution.How do we use parallel lines in coordinate geometry? Pedestrian crossings: all painted lines lie along the same direction and road, but these lines will never meet.Lines on a writing pad: all lines are found on the same plane, but they will never meet.Roadways and tracks: the opposite tracks and roads will share the same direction, but they will never meet at one point.What are some real-world examples of parallel lines? These are some examples of parallel lines in different directions: horizontally, diagonally, and vertically.Īnother important fact about parallel lines: they share the same direction. Parallel lines are equidistant lines (lines having equal distance from each other) that will never meet. Since parallel lines are used in different branches of math, we need to master them as early as now. Understanding what parallel lines are can help us find missing angles, solve for unknown values, and even learn what they represent in coordinate geometry. Parallel lines are lines that are lying on the same plane but will never meet. Let’s go ahead and begin with its definition. When working with parallel lines, it is important to be familiar with their definition and properties. Parallel Lines – Definition, Properties, and Examples