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  2. CA Geometry: More proofs - Khan Academy

    www.khanacademy.org/.../geometry-worked-examples/v/ca-geometry-more-proofs

    It says, use the proof to answer the question below. So they gave us that angle 2 is congruent to angle 3. So the measure of angle 2 is equal to the measure of angle 3.

  3. Khan Academy

    www.khanacademy.org/math/geometry/hs-geo-congruence/hs-geo-congruence-theorems/...

    Geometry; Algebra 2; Integrated math 1; Integrated math 2; Integrated math 3; Algebra basics; Trigonometry; Precalculus; High school statistics; Statistics & probability; College algebra; AP®︎/College Calculus AB; AP®︎/College Calculus BC; AP®︎/College Statistics; Multivariable calculus; Differential equations; Linear algebra; See all Math

  4. Khan Academy

    www.khanacademy.org/math/geometry-home

    If you're seeing this message, it means we're having trouble loading external resources on our website. If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked.

  5. Proof of infinite geometric series as a limit (video) | Khan...

    www.khanacademy.org/.../bc-series-optional/v/infinite-geometric-series

    The video provides a proof for the sum of an infinite geometric series using limits. When the absolute value of the common ratio (r) is between 0 and 1, the limit of the series converges to a finite sum. The formula for the sum is a / (1 - r), where a is the first term. Created by Sal Khan.

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

    www.khanacademy.org/math/geometry-home/triangle-properties

    Geometry; Algebra 2; Integrated math 1; Integrated math 2; Integrated math 3; Algebra basics; Trigonometry; Precalculus; High school statistics; Statistics & probability; College algebra; AP®︎/College Calculus AB; AP®︎/College Calculus BC; AP®︎/College Statistics; Multivariable calculus; Differential equations; Linear algebra; See all Math

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

    www.khanacademy.org/math/geometry-home/cc-geometry-circles

    Geometry; Algebra 2; Integrated math 1; Integrated math 2; Integrated math 3; Algebra basics; Trigonometry; Precalculus; High school statistics; Statistics & probability; College algebra; AP®︎/College Calculus AB; AP®︎/College Calculus BC; AP®︎/College Statistics; Multivariable calculus; Differential equations; Linear algebra; See all Math

  8. Prove triangle congruence (practice) | Khan Academy

    www.khanacademy.org/math/geometry/hs-geo-congruence/xff63fac4:hs-geo-congruent...

    Given figures composed of 2 triangles, complete or find the error in the proof that the triangles are congruent.

  9. Infinite geometric series formula intuition (video) | Khan...

    www.khanacademy.org/.../bc-series-optional/v/deriving-geometric-series-sum-formula

    In the video, we learn about the sum of an infinite geometric series. The sum converges (has a finite value) when the common ratio (r) is between -1 and 1. The formula for the sum is S = a / (1 - r), where a is the first term.

  10. Khan Academy

    www.khanacademy.org/math/geometry-home/geometry-area-perimeter/geometry-area...

    The area of a rectangle and a parallelogram is found by multiplying the base by the height. For a triangle, the area is half of a parallelogram's, so it's calculated by multiplying the base by the height and then dividing by 2.

  11. Pythagorean theorem proof using similarity (video) | Khan Academy

    www.khanacademy.org/math/geometry/hs-geo-trig/hs-geo-pythagorean-proofs/v/...

    Get ready for Geometry; Get ready for Algebra 2; Get ready for Precalculus; Get ready for AP® Calculus; Get ready for AP® Statistics; Math: high school & college; Algebra 1; Geometry; ... Bhaskara's proof of the Pythagorean theorem. Pythagorean theorem proof using similarity. Another Pythagorean theorem proof. Math > High school geometry >