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: Identifying Parallel and Perpendicular Lines
Identifying parallel and perpendicular lines in a diagram. [3:34]
Khan Academy
Khan Academy: Geometry: Area, Circumference, Volume
This video demonstrates an understanding of perimeter, volume, surface area, area, and Pythagorean theorem.
Khan Academy
Khan Academy: Geometry: Deductive Reasoning
This video explains what is deductive reasoning.
Khan Academy
Khan Academy: Geometry: Basic Trigonometry
Problems address the equation of a circle, basic trignometry.
Khan Academy
Khan Academy: Volume: Solid Geometry Volume
A video showing how to find the volume of triangular prisms and cubes.
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: Geometry: Circle Area Chords Tangent
This video [10:06] contains touches the following topics: Pythagorean theorem, 45-45-90 triangles, 30-60-90 triangles, circumscribed polygons, area, chord length and tangents to circles.
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]
Virtual Nerd
Virtual Nerd: How Do You Determine if a Triangle Is a Right Triangle
In this video lesson a students learns how to determine if a triangle is a right triangle by using the Pythagorean Theorem.
Sophia Learning
Sophia: Vsepr: Bent Molecules: Lesson 2
This lesson will explore bent shaped molecules including bond angles. It is 2 of 2 in the series titled "VSEPR: Bent Molecules."
Massachusetts Institute of Technology
Mit: Blossoms: Are Random Triangles Acute or Obtuse?
An MIT mathematics professor examines the probability of a random triangle being either obtuse or acute in a video [32:44] on geometrical probability. Video is accompanied by a teacher's guide, transcript, and several links on linear...
Massachusetts Institute of Technology
Mit: Blossoms: The Broken Stick Experiment
An MIT engineering professor leads teachers and students through an activity in triangle formation and probability that requires a meter stick and other basic classroom materials. This video [33:08] is accompanied by a teacher's guide,...
Khan Academy
Khan Academy: Algebra: Descartes and Cartesian Coordinates
Video explaining the contributions of Rene Decartes to Algebra and Geometry. [11:22]
Khan Academy
Khan Academy: Perpendicular Radius Bisects Chord
Proof that if a radius is perpendicular to a chord then it bisects the chord. This video also appears in the Geometry: Circles strand. [6:57]
Khan Academy
Khan Academy: Algebra: Three Equation Application Problem
This video demonstrates how to solve a problem in a geometry context by setting up and solving a systems of equations in three variables. [8:15]
Khan Academy
Khan Academy: Calculus: 2011 Calculus Ab Free Response #4A
This video [4:48] shows how to determine the integral of an unusual function using geometry to find the area under the curve. Also shows how to find the derivative of a function which contains an integral by using the Fundamental Theorem...
Khan Academy
Khan Academy: Linear Algebra: Vector Triangle Inequality
Video first reviews the Cauchy-Schwarz inequality. Then shows a proof of the triangle inequality for vectors and relates it to the triangle inequality from 2-dimensional geometry. [18:53]
Crash Course
Crash Course: Trippy Shapes
In school, you learn about shapes with sides and edges - but there are weird shapes out there (beyond our 3 dimensions) that defy our normal idea of geometry. QuanQuan and Jenny explain, knit, and 3D print their way through trippy...
Khan Academy
Khan Academy: Algebra: Conic Sections: Three Points Defining a Circle
A video lesson that describes how any three non-collinear points actually define a circle. First it is shown that three points define a triangle. Then it is shown that the circumcenter of that triangle is actually the center of the...
PBS
Pbs Learning Media: Real Life Math: Woodworker
Listen to a master craftsman explain many of the ways that mathematics is used in woodworking, including number operations; geometry; ratios and proportions; and measurement. In the accompanying activity, students will draw a scale...
Loyola University Chicago
Math Flix: Similar Figures: Proof Using Proportions
This QuickTime movie provides an opportunity to develop the basic geometric term, similar, by checking to see if figures are proportionaly similar. As you watch and listen to the teacher and student interact it helps clarify the thinking...
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