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Learn how the number Pi allows us to relate the radius, diameter, and circumference of a circle.
The formula for the volume of a sphere is V = 4/3 π r³, where V = volume and r = radius. The radius of a sphere is half its diameter. So, to calculate the volume of a sphere given the diameter of the sphere, you can first calculate the radius, then the volume.
Learn how to find the radius and diameter from the circumference of a circle on Khan Academy.
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Lesson 3: Streamline flow. Volume flow rate and equation of continuity. Continuity equation.
Review the key terms, equations, and skills related to current, resistance, and resistivity, including how to find the current direction and what resistance depends on.
Proofs of inscribed and central angles in geometry.
Learn how to find the radius or diameter of a circle from its circumference or area.
The larger the diameter of the axon, the less likely the incoming ions will run into something that could bounce them back. The action potential depends on positive ions continually traveling away from the cell body, and that is much easier in a larger axon.