Khan Academy
7,713 videos, +5,400,000 subscribers



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Financial Times October 201118:1601 list
Euler line | Special properties and parts of triangles | Geometry | Khan Academy6:130
Review of triangle properties | Special properties and parts of triangles | Geometry | Khan Academy9:570
Derivative intuition module | Taking derivatives | Differential Calculus | Khan Academy3:580
Proof: Triangle altitudes are concurrent (orthocenter) | Geometry | Khan Academy10:100
Median centroid right triangle example | Geometry | Khan Academy9:100
Proving that the centroid is 2-3rds along the median | Geometry | Khan Academy6:560
Exploring medial triangles | Special properties and parts of triangles | Geometry | Khan Academy11:330
At Words 17:800
Medians divide into smaller triangles of equal area | Geometry | Khan Academy7:460
Angle bisector theorem examples | Geometry | Khan Academy3:400
Inradius, perimeter, and area | Special properties and parts of triangles | Geometry | Khan Academy7:290
Angle bisector theorem proof | Special properties and parts of triangles | Geometry | Khan Academy8:350
Incenter and incircles of a triangle | Geometry | Khan Academy7:580
Point-line distance and angle bisectors | Geometry | Khan Academy10:570
Three points defining a circle | Special properties and parts of triangles | Geometry | Khan Academy10:900
Circumcenter of a right triangle | Geometry | Khan Academy5:420
Circumcenter of a triangle | Special properties and parts of triangles | Geometry | Khan Academy12:300
Perpendicular radius bisects chord | Congruence | Geometry | Khan Academy6:570
Area of Koch snowflake (part 2) - advanced | Perimeter, area, and volume | Geometry | Khan Academy6:330
Area of Koch snowflake (part 1) - advanced | Perimeter, area, and volume | Geometry | Khan Academy12:300
Area of an equilateral triangle | Perimeter, area, and volume | Geometry | Khan Academy3:430
30-60-90 triangle example problem | Right triangles and trigonometry | Geometry | Khan Academy6:410
The golden ratio | Introduction to Euclidean geometry | Geometry | Khan Academy14:420
45-45-90 triangle side ratios | Right triangles and trigonometry | Geometry | Khan Academy5:420
30-60-90 triangle side ratios proof | Right triangles and trigonometry | Geometry | Khan Academy7:000
Examples using Pythagorean Theorem4:530
Pythagorean theorem proof using similarity | Geometry | Khan Academy9:530
Finding area using similarity and congruence | Similarity | Geometry | Khan Academy10:700
Similar triangle example problems | Similarity | Geometry | Khan Academy9:240
Health Care Costs in US vs Europe14:3401 list
Conversation About Drug Pricing13:3301 list
Blue Cross and Blue Shield10:5001 list
Inflammation9:9001 list
Vitamin C and the Limeys7:2201 list
Systemic Thinking About Cancer11:3401 list
Similarity example where same side plays different roles | Similarity | Geometry | Khan Academy6:500
Challenging similarity problem | Similarity | Geometry | Khan Academy9:530
Tom Brokaw interviews Sal at Education Nation 201112:9001 list
Similarity example problems | Similarity | Geometry | Khan Academy7:370
Similarity postulates | Similarity | Geometry | Khan Academy12:140
Sal during Education Week (Sep 2011) 17:3501 list
Khan Academy on 20 20 (Sep 2011)3:1801 list
KA on John Stossel Documentary4:5301 list
Similar triangle basics | Similarity | Geometry | Khan Academy9:170
Challenging perimeter problem | Perimeter, area, and volume | Geometry | Khan Academy9:560
Koch snowflake fractal | Perimeter, area, and volume | Geometry | Khan Academy9:120
Interesting perimeter and area problems | Perimeter, area, and volume | Geometry | Khan Academy8:130
Triangle area proofs | Perimeter, area, and volume | Geometry | Khan Academy10:230
Perimeter and area: the basics | Perimeter, area, and volume | Geometry | Khan Academy8:250
Figuring out all the angles for congruent triangles example | Congruence | Geometry | Khan Academy4:350
Example involving an isosceles triangle and parallel lines | Congruence | Geometry | Khan Academy3:160
Another isosceles example problem | Congruence | Geometry | Khan Academy5:340
Equilateral and isosceles example problems | Congruence | Geometry | Khan Academy6:270
Equilateral triangle sides and angles congruent | Congruence | Geometry | Khan Academy6:300
Congruent legs and base angles of isosceles triangles | Congruence | Geometry | Khan Academy9:300
Congruent triangle example 2 | Congruence | Geometry | Khan Academy12:140
Congruent triangle proof example | Congruence | Geometry | Khan Academy5:460
More on why SSA is not a postulate | Congruence | Geometry | Khan Academy7:240
Finding congruent triangles | Congruence | Geometry | Khan Academy7:280
Sum of the exterior angles of convex polygon | Geometry | Khan Academy5:240
Sum of interior angles of a polygon | Angles and intersecting lines | Geometry | Khan Academy9:110
Two column proof showing segments are perpendicular | Congruence | Geometry | Khan Academy11:600
Other triangle congruence postulates | Congruence | Geometry | Khan Academy13:280
SSS to show a radius is perpendicular to a chord that it bisects | Geometry | Khan Academy8:200
Congruent triangles and SSS | Congruence | Geometry | Khan Academy11:290
Sum of Interior Angles of Any Polygon10:200
Challenging triangle angle problem | Angles and intersecting lines | Geometry | Khan Academy8:370
Triangle angle example 3 | Angles and intersecting lines | Geometry | Khan Academy5:430
Finding more angles | Angles and intersecting lines | Geometry | Khan Academy6:500
Proof: Corresponding angle equivalence implies parallel lines | Geometry | Khan Academy5:180
Triangle angle example 2 | Angles and intersecting lines | Geometry | Khan Academy4:550
Triangle angle example 1 | Angles and intersecting lines | Geometry | Khan Academy6:300
Proof - Sum of Measures of Angles in a Triangle are 1806:310
Angles formed by parallel lines and transversals | Geometry | Khan Academy7:800
Proof: Vertical angles are equal | Angles and intersecting lines | Geometry | Khan Academy4:510
Introduction to vertical angles | Angles and intersecting lines | Geometry | Khan Academy7:190
Complementary and supplementary angles | Angles and intersecting lines | Geometry | Khan Academy8:310
Measuring angles in degrees | Angles and intersecting lines | Geometry | Khan Academy8:230
Measuring angles using a protractor | Angles and intersecting lines | Geometry | Khan Academy3:260
Angle basics | Angles and intersecting lines | Geometry | Khan Academy6:490
Language and notation of the circle | Introduction to Euclidean geometry | Geometry | Khan Academy11:130
Basic Language and Notation of Geometry13:000
Inverse property of multiplication | Arithmetic properties | Pre-Algebra | Khan Academy3:170
Inverse property of addition | Arithmetic properties | Pre-Algebra | Khan Academy3:000
Partial quotient method of division 2 | Multiplication and division | Arithmetic | Khan Academy7:560
Partial quotient method of division | Multiplication and division | Arithmetic | Khan Academy8:270
Interest Rate Swap 24:480
Interest Rate Swap 13:510
Interpretting Futures Fair Value in the PreMarket3:380
Center for Future of Museums18:4301 list
2011 Calculus BC Free Response #6d11:520
Proof: Bounding the Error or Remainder of a Taylor Polynomial Approximation15:900
Error or Remainder of a Taylor Polynomial Approximation11:270
Brainwave Sep 201116:2801 list
2011 Calculus BC Free Response #6c2:580
2011 Calculus BC Free Response #6b9:590
2011 Calculus BC Free Response #6a7:420
2011 Calculus BC Free Response #3 (b & c)8:260
2011 Calculus BC Free Response #3a5:420



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