Virtual Nerd
Virtual Nerd: What Are Perpendicular Lines?
The angles formed by perpendicular lines will always be the same. Take a look at this tutorial to learn about perpendicular lines and see a special trick involving them. [5:22]
Khan Academy
Khan Academy: Parallel and Perpendicular Lines
Demonstrates how to identify parallel and perpendicular lines in geometric drawings. [3:34]
Virtual Nerd
Virtual Nerd: What Are Skew Lines?
This video tutorial introduces skew lines which are two lines that do not intersect and are not parallel. [3:46]
CK-12 Foundation
Ck 12: Elem Math: Overview of Lines Curves Vertices and Sides of 2 D Shapes
[Free Registration/Login may be required to access all resource tools.] Students watch a video overview on lines, curves and vertices of two dimensional shapes.
Sophia Learning
Sophia: Perpendicular Lines
This lesson defines perpendicular lines and gives an assessment to check understanding.
Khan Academy
Khan Academy: More Analytic Geometry: Perpendicular Lines 2
This video demonstrates how to find the equation of a line when given a point on the line and the equation of a line perpendicular to it.
Khan Academy
Khan Academy: More Analytic Geometry: Parallel Lines 3
This video demonstrates how to determine if lines are parallel given the equations.
Khan Academy
Khan Academy: Geometry: Angles of Parallel Lines 2
Explains how to determine the measures of all the angles formed when parallel lines are cut by a transversal based on the measure of one angle. Explains how to use corresponding congruent angles to determine if lines cut by a transversal...
Khan Academy
Khan Academy: More Analytic Geometry: Perpendicular Line Slope
This video shows how to find the slope of a line perpendicular to another line.
Khan Academy
Khan Academy: Geometry: Language and Notation of Basic Geometry
Explains terms and notation of basic elements of geometry. [12:57]
Khan Academy
Khan Academy: Geometry: Ca Geometry: Deductive Reasoning
Demonstrates solutions to problems #1-3 of California Geometry released state test questions. Problems address understanding of deductive reasoning and congruent angles created by parallel lines cut by a transversal. [10:17]
Khan Academy
Khan Academy: Geometry: Ca Geometry: More Proofs
Demonstrates solutions to problems #7-10 of California Geometry released state test questions. Problems address understanding of congruent angle pairs when parallel lines are cut by a transversal, counterexamples, and properties of the...
Khan Academy
Khan Academy: Geometry: Ca Geometry: Pythagorean Theorem, Compass Constructions
This video tutorial demonstrates solutions to problems #51-55 of the California Geometry released state test questions. Problems address proving and using the Pythagorean theorem and compass constructions. [12:35]
Khan Academy
Khan Academy: Geometry: Ca Geometry: Compass Construction
Demonstrates solutions to problems #56-60 of the California Geometry released state test questions. Problems address compass constructions, slope of perpendicular lines, and using the distance formula. [12:49]
Khan Academy
Khan Academy: Geometry: Ca Geometry: Triangles and Parallelograms
In this video lesson [11:14], the instructor demonstrates solutions to problems #21-25 of California Geometry released state test questions. Problems address understanding of the triangle inequality theorem, angle relationships with...
Khan Academy
Khan Academy: Geometry: Proof Sum of Measures of Angles in a Triangle Are 180
Proof that the sum of the angles in a triangle is 180 using the relationship of angles formed when parallel lines are cut by a transversal. This video also appears in the Geometry: Triangles strand. [6:31]
Khan Academy
Khan Academy: Geometry: Euler Line
Demonstrates that the circumcenter, orthocenter, and centroid of a triangle all lie on a line called an Euler line. [6:12]
Khan Academy
Khan Academy: Algebra: Conic Sections: Tangent Line Hyperbola Relationship
A video lesson showing the algebraic relationship between the equation of an arbitrary hyperbola and its arbitrary tangent line. [10:04]
Khan Academy
Khan Academy: Geometry: Angles at the Intersection of Two Lines
Explains how to determine the measures of angles formed by interecting lines when given the measure of one angle. [7:19]
CK-12 Foundation
Ck 12: Elem Math: Overview of Reflective Symmetry
[Free Registration/Login may be required to access all resource tools.] Students watch a video tutorial on line or reflective symmetry.
Virtual Nerd
Virtual Nerd: What Is a Line Segment?
Take a look at this tutorial to learn about line segments, how to name them, and what the midpoint of a line segment is. [3:13]
Khan Academy
Khan Academy: Terms & Labels in Geometry
Learn about geometry terms like point, line, and ray. We will also learn how to label them.
Virtual Nerd
Virtual Nerd: What Are the Endpoints of a Line Segment?
Watch this tutorial to learn about the endpoints of a line segment. [1:18]
Khan Academy
Khan Academy: Angles, Parallel Lines, & Transversals
Looks at parallel lines and intersecting lines (transversals), and the angles they form. [7:08]
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