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All of the site's resources are available to anyone. It doesn't matter if you are a student, teacher, home-schooler, principal, adult returning to the classroom after 20 years, or a friendly alien just trying to get a leg up in earthly biology. The Khan Academy's materials and resources are available to you completely free of charge.

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Over 3,800 Videos

Our library of videos covers K-12 math, science topics such as biology, chemistry, and physics, and even reaches into the humanities with playlists on finance and history. Each video is a digestible chunk, approximately 10 minutes long, and especially purposed for viewing on the computer.

You're joining millions of Khan Academy students from all over the world who learn at their own pace every single day.

 
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Worked Examples : Interesting Perimeter and Area Problems

By: Sal Khan

Three example problems involving perimeter and area

This is a first year, high-school level course on Geometry (which is based on Euclid's elements). It revisits many of the basic geometrical concepts studied in earlier courses, but addresses them with more mathematical rigor. There is strong focus on prov

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Worked Examples : Challenging Perimeter Problem

By: Sal Khan

Perimeter of rectangle covered by 9 non-overlapping squares. From 200) American Invitational Math Exam

This is a first year, high-school level course on Geometry (which is based on Euclid's elements). It revisits many of the basic geometrical concepts studied in earlier courses, but addresses them with more mathematical rigor. There is strong focus on prov

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Work and energy : Work/Energy problem with Friction

By: Sal Khan

A conservation of energy problem where all of the energy is not conserved.

Work and energy. Potential energy. Kinetic energy. Mechanical advantage. Springs and Hooke's law.

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Work and energy : Work and Energy (part 2)

By: Sal Khan

More on work. Introduction to Kinetic and Potential Energies.

Work and energy. Potential energy. Kinetic energy. Mechanical advantage. Springs and Hooke's law.

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Work and energy : Introduction to work and energy

By: Sal Khan

Introduction to work and energy

Work and energy. Potential energy. Kinetic energy. Mechanical advantage. Springs and Hooke's law.

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Work and energy : Conservation of Energy

By: Sal Khan

Using the law of conservation of energy to see how potential energy is converted into kinetic energy

Work and energy. Potential energy. Kinetic energy. Mechanical advantage. Springs and Hooke's law.

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Why parties in a cartel will cheat : Why Parties to Cartels Cheat

By: Sal Khan

Why duopolists would benefit to form a cartel and why it makes sense for them to cheat

You know what Nash equilibrium is (from the other tutorial). Now we apply it to a scenario that is fairly realistic--parties to a cartel cheating. A cartel is a group of actors that agree (sometimes illegally) to coordinate their production/pricing to max

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Why parties in a cartel will cheat : Game Theory of Cheating Firms

By: Sal Khan

Pareto Optimality and more on Nash Equilibrium. Seeing how cheating duopolists parallels the prisoners dilemma

You know what Nash equilibrium is (from the other tutorial). Now we apply it to a scenario that is fairly realistic--parties to a cartel cheating. A cartel is a group of actors that agree (sometimes illegally) to coordinate their production/pricing to max

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What drives oil prices : Short-Run Oil Prices

By: Sal Khan

Thinking about what moves oil prices

The core ideas in microeconomics. Supply, demand and equilibrium.

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What drives oil prices : Breakdown of Gas Prices

By: Sal Khan

Where the dollars at the pump go

The core ideas in microeconomics. Supply, demand and equilibrium.

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Waves and optics : When the source and the wave move at the same v...

By: Sal Khan

When the source and the wave move at the same velocity

Projectile motion, mechanics and electricity and magnetism. Solid understanding of algebra and a basic understanding of trigonometry necessary.

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Waves and optics : Virtual Image

By: Sal Khan

Virtual Image

Projectile motion, mechanics and electricity and magnetism. Solid understanding of algebra and a basic understanding of trigonometry necessary.

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Waves and optics : Total Internal Reflection

By: Sal Khan

Critical incident angle and total internal reflection

Projectile motion, mechanics and electricity and magnetism. Solid understanding of algebra and a basic understanding of trigonometry necessary.

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Waves and optics : Specular and Diffuse Reflection 2

By: Sal Khan

Specular and Diffuse Reflection 2

Projectile motion, mechanics and electricity and magnetism. Solid understanding of algebra and a basic understanding of trigonometry necessary.

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Waves and optics : Specular and Diffuse Reflection

By: Sal Khan

Specular and Diffuse Reflection

Projectile motion, mechanics and electricity and magnetism. Solid understanding of algebra and a basic understanding of trigonometry necessary.

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Waves and optics : Snell's Law Example 2

By: Sal Khan

Snell's Law Example 2

Projectile motion, mechanics and electricity and magnetism. Solid understanding of algebra and a basic understanding of trigonometry necessary.

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Waves and optics : Snell's Law Example 1

By: Sal Khan

Snell's Law Example 1

Projectile motion, mechanics and electricity and magnetism. Solid understanding of algebra and a basic understanding of trigonometry necessary.

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Waves and optics : Refraction in Water

By: Sal Khan

Refraction in Water

Projectile motion, mechanics and electricity and magnetism. Solid understanding of algebra and a basic understanding of trigonometry necessary.

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Waves and optics : Refraction and Snell's Law

By: Sal Khan

Refraction and Snell's Law

Projectile motion, mechanics and electricity and magnetism. Solid understanding of algebra and a basic understanding of trigonometry necessary.

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Waves and optics : Parabolic Mirrors and Real Images

By: Sal Khan

Parabolic Mirrors and Real Images

Projectile motion, mechanics and electricity and magnetism. Solid understanding of algebra and a basic understanding of trigonometry necessary.

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