Virtual Nerd
Virtual Nerd: What Is a Line of Reflection?
The line you reflect a figure over is called the line of reflection. Watch this tutorial and learn about the line of reflection. [3:14]
Virtual Nerd
Virtual Nerd: What Are Intersecting Lines?
Two lines that cut across one another are called intersecting lines. Learn about them by watching this tutorial. [7:19]
Virtual Nerd
Virtual Nerd: How Do You Find a Value for X That Makes Two Lines Parallel?
This tutorial shows you how to find x so two lines are parallel. [2:47]
Virtual Nerd
Virtual Nerd: What Is a Tangent Line to a Circle?
For a line to be tangent, it must have a special relationship with a circle. It can only intersect the circle at one point. Watch this tutorial for a better understanding. [3:01]
Sophia Learning
Sophia: Proving Lines Are Tangent to Circles
Prove a line is tangent to a circle by using the converse of the Pythagorean theorem. Take a quiz to assess learning.
Khan Academy
Khan Academy: Parallel & Perpendicular Lines Intro
Learn the properties of parallel and perpendicular lines so that you can easily identify them. [2:08]
Shmoop University
Shmoop: Parallel Lines and Transversals
A video clip showing parallel lines and transversals. Using everyday items to familiarize the student with the concept.
Khan Academy
Khan Academy: Geometry: Euler's Line Proof
Proves that the circumcenter, orthocenter, and centroid all lie on the same line, the Euler line. Proof relies on understanding of properties of similar triangles and properties of special parts of a triangle. [9:50]
Khan Academy
Khan Academy: Geometry: Angles Formed by Parallel Lines and Transversals
Identifies which angles are congruent when parallel lines are cut by a transversal. [7:07]
Khan Academy
Khan Academy: Introduction to Euclidean Geometry
In this video students gain an understanding of basic ideas in geometry and how we represent them with symbols.
Khan Academy
Khan Academy: Geometry: Proof: Opposite Sides of Parallelogram Congruent
Demonstrates how to prove that the opposite sides of a parallelogram are congruent based on knowledge of the special angles created when parallel lines are cut by a transversal and the triangle congruency postulates. [8:30]
Khan Academy
Khan Academy: Geometry: Proof: Opposite Angles of Parallelogram Congruent
This video tutorial demonstrates how to prove that the opposite angles of a parallelogram are congruent based on knowledge of the special angles created when parallel lines are cut by a transversal. [4:08]
Khan Academy
Khan Academy: Geometry: Proof: Diagonals of Parallelogram Bisect Each Other
Demonstrates how to prove that the diagonals of a parallelogram bisect each other based on knowledge of the special angles created when parallel lines are cut by a transversal and the triangle congruency postulates. [9:06]
Khan Academy
Khan Academy: Measuring Line Segments
In this example of measuring a line segment, the numbers span across the positive and negative. Remember, line segments and points are the foundations of geometry, so this is an important concept.
Khan Academy
Khan Academy: More Analytic Geometry: Algebra: Equation of a Line
This video demonstrates how to take two given points of a line and write an equation for that line.
Khan Academy
Khan Academy: Geometry: Triangle Angle Example 2
Shows how to find the measure of missing angles using the triangle sum theorem and vertical angles. This video also appears in the Geometry: Triangles strand. [4:55]
Khan Academy
Khan Academy: Introduction to Euclidean Geometry: Language of the Circle
In this video student learn formal definition of a circle including tangent and secant lines, diameters, radii, major and minor arcs.
Khan Academy
Khan Academy: Geometry: Finding More Angles
Solving for measures of the angles in a triangle using algebra, the triangle sum theorem, and properties of angles created by a transversal that cuts parallel lines. [6:05]
Khan Academy
Khan Academy: Geometry: Similar Triangles
Explains what it means for two triangles to be similar. Diagram of similar triangles is created with two parallel lines cut by two transversals. [9:34]
Khan Academy
Khan Academy: Geometry: Identifying Parallel and Perpendicular Lines
Identifying parallel and perpendicular lines in a diagram. [3:34]
Khan Academy
Khan Academy: More Analytic Geometry: Parallel Lines 2
The video tutorial investigates parallel lines.
Khan Academy
Khan Academy: More Analytic Geometry: Parallel Lines
The video tutorial investigates parallel lines.
Khan Academy
Khan Academy: Geometry: Angles Formed Between Transversals and Parallel Lines
Explains the relationship between the measures of angles formed when parallel lines are cut by a transversal based on relationships of corresponding, vertical, and supplementary angles. [7:53]
Khan Academy
Khan Academy: Geometry: Angles (Part 3)
Identifies and defines the types of angles formed by parallel lines cut by a transversal and the relationship of their measures. Discusses Triangle Sum Theorem. [9:48]
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