Khan Academy on a Stick
Equations and geometry
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Proof: Sum of measures of angles in a triangle are 180
Proof that the sum of the measures of the angles in a triangle are 180
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Triangle angle example 1
Figuring out angles in a triangle. A little about exterior angles being the sum of the remote interior angles
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Triangle angle example 2
Another example finding angles in triangles
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Triangle angle example 3
Multiple ways to solve for the angles of multiple triangles
Angles with triangles and polygons
Do the angles in a triangle always add up to the same thing? Would I ask it if they didn't? What do we know about the angles of a triangle if two of the sides are congruent (an isosceles triangle) or all three are congruent (an equilateral)? This tutorial is the place to find out.
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Similar triangle basics
Introduction to what it means for triangles to be similar
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Similarity postulates
Thinking about what we need to know to determine whether two triangles are similar
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Similar triangle example problems
Multiple examples looking for similarity of triangles
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Similarity example problems
Two example problems involving similarity
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Similarity example where same side plays different roles
The same side not corresponding to itself in two similar triangles
Triangle similarity
This tutorial explains a similar (but not congruent) idea to congruency (if that last sentence made sense, you might not need this tutorial). Seriously, we'll take a rigorous look at similarity and think of some reasonable postulates for it. We'll then use these to prove some results and solve some problems. The fun must not stop!
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The Pythagorean theorem intro
Introduction to the Pythagorean Theorem
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Pythagorean theorem 1
Pythagorean Theorem 1
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Pythagorean theorem 2
Pythagorean Theorem 2
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Pythagorean theorem 3
Pythagorean Theorem 3
Pythagorean theorem
Named after the Greek philosopher who lived nearly 2600 years ago, the Pythagorean theorem is as good as math theorems get (Pythagoras also started a religious movement). It's simple. It's beautiful. It's powerful. In this tutorial, we will cover what it is and how it can be used. We have another tutorial that gives you as many proofs of it as you might need.