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  2. Khan Academy

    www.khanacademy.org/.../cc-7th-area-circumference/a/radius-diameter-circumference

    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.

  3. Arcs, ratios, and radians (article) | Khan Academy

    www.khanacademy.org/math/geometry/hs-geo-circles/hs-geo-radians-intro/a/arcs...

    We can use the constant of proportionality between the arc length and the radius of a sector as a way to describe an angle measure, because all sectors with the same angle measure are similar.

  4. Atomic and ionic radii (video) | Khan Academy

    www.khanacademy.org/science/ap-chemistry-beta/x2eef969c74e0d802:atomic...

    On the periodic table, atomic radius generally decreases as you move from left to right across a period (due to increasing nuclear charge) and increases as you move down a group (due to the increasing number of electron shells).

  5. Khan Academy

    www.khanacademy.org/math/multivariable-calculus/multivariable-derivatives/...

    Learn about curvature and how to differentiate vector-valued functions on Khan Academy.

  6. What is centripetal acceleration? (article) | Khan Academy

    www.khanacademy.org/.../a/what-is-centripetal-acceleration

    Course: Physics archive > Unit 4. Lesson 1: Circular motion and centripetal acceleration. Race cars with constant speed around curve. Visual understanding of centripetal acceleration formula. What is centripetal acceleration? Optimal turns at Indianapolis Motor Speedway with JR Hildebrand.

  7. Khan Academy

    www.khanacademy.org/test-prep/v2-sat-math/x0fcc98a58ba3bea7:geometry-and...

    Course: Digital SAT Math > Unit 5. Lesson 6: Circle equations: foundations. Circle equations | Lesson. Circle equations — Basic example. Circle equations — Harder example.

  8. Khan Academy

    www.khanacademy.org/science/physics/quantum-physics/atoms-and-electrons/a/...

    The webpage explains Bohr's model of hydrogen atom in quantum physics.

  9. Bohr model radii (video) | Khan Academy

    www.khanacademy.org/science/physics/quantum-physics/atoms-and-electrons/v/bohr...

    Atomic Energy Levels. Electronic transitions. Bohr orbits: orbital radius and orbital speed. Bohr model: energy levels.

  10. Impact of increasing the radius (video) | Khan Academy

    www.khanacademy.org/.../cc-7th-area-circ-challenge/v/radius-change-impact

    If we change the radius of a circle, how does the circumference and area change?

  11. Khan Academy

    www.khanacademy.org/science/mechanics-essentials/xafb2c8d81b6e70e3:why-do...

    Angular motion variables. Distance or arc length from angular displacement. Angular velocity and speed. Radius comparison from velocity and angular velocity: Worked example.