Line Teacher Resources

Use the alphabet as a tool for teaching your class about geometric figures. Break apart capital letters into line segments and arcs. Classify angles as right, acute, or obtuse. Identify parallel and perpendicular lines. An excellent...

This video demonstrates how to tell algebraically whether lines are perpendicular. Using three different linear equations in different forms, each is rewritten in slope-intercept form, and their slopes are compared to show whether they...

Starting with three linear equations, how can you tell which lines are parallel? The first equation is rewritten in slope-intercept form. The second equation represents a horizontal line, so it is already in slope-intercept form. The...

This video explores the following problem: Write the equation of a line in slope-intercept form, given a point and an equation of a line that is perpendicular to the line. First the slope is determined based on the known relationship...

Can you tell, algebraically, if three lines are parallel? In this video, Sal demonstrates how to rewrite linear equations in slope-intercept form and compare the slope of each line.

Here are six outstanding art lessons on geometry, line, shape and form, light and shadow, line and pattern, and tessellation for you. Each activity is well-worth implementing with your art students. These lessons would be especially good...

Scatter the TV sales over weeks. Pupils create a scatter plot to display the number of TV sales over a period of several weeks. The interactive allows class members to create two lines of best fit. Then they determine which line fits...

Segment transversals proportionally. Given a diagram with three parallel lines and two transversals, the narrator of a short video points out the parallel lines cut the transversals proportionally. The portion of a long playlist on...

Perpendicular lines are all right. Using the definition of perpendicular, the video lesson introduces perpendicular lines.The portion a basic geometry playlist makes connections between the rules of parallel lines and perpendicular lines.

Is it possible for a pair to be parallel and skew? The resource provides the class opportunities to find out by examining the properties of parallel and skew lines. Part of a playlist on basic geometry, the video includes a brief...

Get the slope right with two easy steps. By placing two perpendicular lines on the coordinate plane, the video determines the relationship of the slopes of the two line lines. The resource is a part of an informative and extensive...

Discover the parallel structure of parallel lines. Provided with two parallel lines on a coordinate plane, the presenter shows that the rise and run, or slope, of the two lines are the same. The resource, which is a portion of a larger...

The coordinate plane links key geometry and algebra concepts in this approachable but rigorous unit. The class starts by developing the distance formula from the Pythagorean Theorem, then moves to applications of slope. Activities...

Construct tangent lines and make the connection to tangent functions. An informative lesson reviews the geometry origins of the tangent function. Pupils use that information to determine how to construct a tangent to a circle from a...

Get jamming with lines and sing along to this karaoke that reviews the main types of lines. Your learners can't forget the main properties of lines when they sing the chorus on the karaoke song after the included slide show. The slides...

Parallel lines are often incorrectly defined as lines that do not intersect. The instructor in a concept video explains the difference between parallel and skew lines. He also refers to the correct notation and symbols during the lesson.

This unit on connecting algebra and geometry covers a number of topics including worksheets on the distance formula, finding the perimeter and area of polynomials, the slope formula, parallel and perpendicular lines, parallelograms,...

Take geometry into the real world! You'll find just about everything you need for a fun group project reinforcing terms such as: quadrilateral, parallel lines, hexagon, circumference, vertex, acute angle, polygon, and many more. Of...

Which shapes are symmetrical? Third graders decide which shapes have lines of symmetry, and which shapes are not symmetrical. They work on 13 shapes and symbols, four of which have lines already drawn through them. Use this resource to...

Challenge young mathematicians' understanding of symmetry. Provided with images of different shapes, letters, and national flags, students are tasked with identifying the lines of symmetry and order of rotational symmetry associated with...

Assessing progress is easy using a quick quiz focused on dilations with the center on the line! Geometry geniuses graph the images of points resulting from a dilation with a center point. Then, they must describe the relationship between...

Practice the properties of lines in the coordinate plane. Young mathematicians use Cabri on their graphing calculator to determine the slope ratios. They use the change in y-coordinates/change in x-coordinates. Additionally, they find...

What kind of lines have slopes that are the opposite reciprocal of each other? Parallel lines? No. Parabolas? No. Perpendicular lines? Yes! Watch and listen as the instructor demonstrates how to make these determinations about...

There's no easier test than the vertical line test. Learners drag a vertical line across the graphs of several relations in an interactive. They answer a set of challenge questions that focus on whether the graphs represent functions.