Khan Academy
Khan Academy: Kant: On Space, Part 2
Scott Edgar (Saint Mary's) returns to Kant's argument from Geometry, this time examining two famous objections to it: the famous 'neglected alternative' objection and a powerful objection from 20th century physics. [5:18]
Khan Academy
Khan Academy: Weighted Average of Two Points
This video [3:56] lesson focuses on how to bridge two worlds: the world of images and geometry and the world of algebra, numbers, and equations. We will develop a formula that will allow us to compute points exactly on the parabola. And...
PBS
Pbs Learning Media: Mighty Mathematicians
Math is as easy as 1,2,3 with a little help from your favorite PBS KIDS friends. The media in this collection is centered around counting, operations, geometry and more! Dive into each sub-collection and discover new ways to explore math...
Sophia Learning
Sophia: Geometry: Measurement of Angles in Radians: Lesson 3
During this lesson, you'll find out how radians are related to angles, how to note radians, and what certain radians stand for. It is 3 of 5 in the series titled "Measurement of Angles in Radians." [2:10]
Sophia Learning
Sophia: Geometry: Measurement of Angles in Radians: Lesson 4
During this lesson, you'll find out how radians are related to angles, how to note radians, and what certain radians stand for. It is 4 of 5 in the series titled "Measurement of Angles in Radians." [3:19]
Sophia Learning
Sophia: Geometry: Measurement of Angles in Radians: Lesson 1
During this lesson, you'll find out how radians are related to angles, how to note radians, and what certain radians stand for. It is 1 of 5 in the series titled "Measurement of Angles in Radians." [3:05]
Math Mammoth
Math Mammoth: Pythagorean Theorem and Geometry 2: Diagonal of a Square
This video demonstrates how to calculate the length of a square's diagonal using the Pythagorean Theorem. [1:29]
Math Mammoth
Math Mammoth: Pythagorean Theorem and Geometry 3: Volume of a Triangular Prism
This video demonstrates how to find the volume of a triangular prism by first determining the altitude of the isosceles triangle base using the Pythagorean Theorem, and then inserting it into the volume formula. [2:46]
Massachusetts Institute of Technology
Mit: Blossoms: The Geometry of Parabolic Sand Dunes
One of the main problems facing Saudi Arabia and many other countries in the region is the movement of sand, which threatens the urban areas. With the expansion of new installations and other projects, sand dune movement is costing...
Khan Academy
Khan Academy: Geometry: Congruent and Similar Triangles
Explains how to determine if triangles are congruent or similar. [3:53]
Khan Academy
Khan Academy: Geometry: 30 60 90 Triangles Ii
In this video tutorial, the instructor demostrates how to apply the special relationship between the legs and hypotenuse of a 30-60-90 triangle. Solves two different example problems using the relationship. Practice problems available....
Khan Academy
Khan Academy: Geometry: Rhombus Diagonals
Demonstrates how to prove that the diagonals of a rhombus are perpendicular bisectors of each other based on knowledge of triangle congruency postulates and properties of altitudes. [4:38]
Khan Academy
Khan Academy: Geometry: Challenging Perimeter Problem
Demonstrates how to solve a problem from the 2000 American Invitational Mathematics Examination which involves finding the perimeter of a rectangle covered by nine overlapping squares. [9:56]
Khan Academy
Khan Academy: Geometry: Incenter and Incircles of a Triangle
Explains that the intersection of the three angle bisectors of a triangle form the incenter of the triangle. [7:58]
Khan Academy
Khan Academy: Geometry: Proof Rhombus Area Half Product of Diagonal Length
Demostrates how to prove that one way to find the area of a rhombus is by taking half the product of the diagonals. [5:07]
Khan Academy
Khan Academy: Geometry: Quadrilateral Properties
This video tutorial [5:07] demonstrates how to use the basic properties of parallelograms, rectangles, squares, rhombi, and trapezoids to determine what are the possible ways to name a given geometric shape.
Khan Academy
Khan Academy: Geometry: Area of Koch Snowflake (Part 1) Advanced
Demonstrates how to find the area of a Koch snowflake by summing an infinite geometric series based on the area of an equilateral triangle. [12:30]
Khan Academy
Khan Academy: Geometry: Challenging Similarity Problem
Explains how to determine unknown side lengths in a complex diagram that involves similar triangles. [9:53]
Khan Academy
Khan Academy: Geometry: Corresponding Angle Equivalence Implies Parallel Lines
Proof by contradiction that if two lines cut by a transversal create congruent corresponding angles then the lines are parallel. [5:18]
Khan Academy
Khan Academy: Geometry: Koch Snowflake Fractal
Explanation of the Koch Snowflake and why it has an infinite perimeter but a finite area. [9:11]
Khan Academy
Khan Academy: Geometry: Equilateral Triangle Sides and Angles Congruent
In this video tutorial [6:29], the instructor models a proof so show that if the sides of an equilateral triangle are congruent, then all the angles are congruent and vice versa. The instructor uses the knowledge of congruent legs and...
Khan Academy
Khan Academy: Geometry: Finding Area Using Similarity and Congruence
Explains how to determine the area of a pentagonal shaded region in a triangle. The triangle that is broken into multiple similar and congruent triangles. [10:07]
Khan Academy
Khan Academy: Geometry: Two Column Proof Showing Segments Are Perpendicular
In this video tutorial [11:06], the instructor shows how to construct a two-column proof using triangle congruence postulates to prove that two line segments are perpendicular.
Khan Academy
Khan Academy: Geometry: Proof Rhombus Diagonals Are Perpendicular Bisectors
Demonstrates how to prove that the diagonals of a rhombus are perpendicular bisectors of each other based on knowledge of properties of parallelogram diagonals, triangle congruency, and supplementary angles. [4:04]
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