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  1. Geometry (all content) - Khan Academy

    Unit 11: Congruence Transformations and congruence Triangle congruence Theorems concerning triangle properties Working with triangles Theorems concerning quadrilateral properties Proofs of …

  2. CA Geometry: More proofs (video) | Khan Academy

    Help with a list of terms and or theories the kids need to know to complete a proof would be fabulous! What I find interesting, is that the information to explain and fully understand "the why" of a proof …

  3. Properties of congruence and equality (article) | Khan Academy

    Learn when to apply the reflexive property, transitive, and symmetric properties in geometric proofs. Learn the relationship between equal measures and congruent figures.

  4. Khan Academy

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  5. High school geometry - Khan Academy

    Learn high school geometry—transformations, congruence, similarity, trigonometry, analytic geometry, and more (aligned with Common Core standards).

  6. Quadrilaterals | Geometry (all content) | Math | Khan Academy

    Quadrilateral proofs & angles Learn Proof: Opposite sides of a parallelogram Proof: Diagonals of a parallelogram

  7. Transformation properties and proofs | High school geometry | Khan …

    Proofs with transformations Learn Proofs with transformations Transformation properties and proofs FAQ

  8. Proofs with transformations (video) | Khan Academy

    Perform a translation that proves corresponding angles are always equal, and select the option which explains the proof. All right, so let's see what they have down here.

  9. Triangles | Geometry (all content) | Math | Khan Academy

    Learn Review of triangle properties Euler line Euler's line proof Unit test Test your understanding of Triangles with these 10 questions.

  10. Circles | Geometry (all content) | Math | Khan Academy

    Learn Circles glossary Radius, diameter, circumference & π Proof: all circles are similar