Quadrilaterals (Khan Academy)

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(1) Quadrilateral proofs & angles Proof: Opposite sides of a parallelogram Proof: Diagonals of a parallelogram Proof: Opposite angles of a parallelogram Quadrilateral angles Proof: Rhombus diagonals are perpendicular bisectors Proof: Rhombus area Area of parallelogram proof Whether a special quadrilateral can exist Rhombus diagonals

Special properties and parts of triangles (Khan Academy)

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You probably like triangles. You think they are useful. They show up a lot. What you’ll see in this topic is that they are far more magical and mystical than you ever imagined! (1) Triangle inequality theorem Triangle inequality theorem Triangle inequality theorem (2) Perpendicular bisectors Circumcenter of a triangle Circumcenter of a right triangle […]

Angles & intersecting lines (Khan Academy)

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This topic continues our journey through the world of Euclid by helping us understand angles and how they can relate to each other. (1) Angle basics & measurement Angles: introduction Measuring angles in degrees Measuring angles using a protractor Measuring angles using a protractor 2 Measure angles Acute, right, & obtuse angles Angle types Angle […]

Tools of geometry (Khan Academy)

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(1) Lines, line segments, & rays Lines, line segments, & rays Identify rays, lines, & line segments Identifying rays Drawing parallel line segments Draw rays, lines, & line segments (2) Points, lines, & planes Points, lines, and planes Specifying planes in three dimensions (3) Geometric definitions Geometric definitions Geometric definitions example (4) The golden ratio […]

Khan Academy

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Khan Academy is perhaps the best known free collection of online courses. The subjects span a great range of topics, including everything from math and science to art history. According to their about page: Our mission is to provide a free, world‑class education for anyone, anywhere. A full list of the subjects they offer is […]