This video demonstrates how to determine if lines are parallel given the equations.

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]

Identifying parallel and perpendicular lines in a diagram. [3:34]

This video demonstrates an understanding of perimeter, volume, surface area, area, and Pythagorean theorem.

Midpoint Formula

This video explains what is deductive reasoning.

Problems address the equation of a circle, basic trignometry.

A video showing how to find the volume of triangular prisms and cubes.

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...

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.

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]

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]

In this video lesson a students learns how to determine if a triangle is a right triangle by using the Pythagorean Theorem.

This lesson will explore bent shaped molecules including bond angles. It is 2 of 2 in the series titled "VSEPR: Bent Molecules."

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...

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,...

Video explaining the contributions of Rene Decartes to Algebra and Geometry. [11:22]

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]

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]

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...

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]

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...

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...

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...