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Radius, diameter, circumference & π - Khan Academy
Now, we know how the diameter and the radius relates, but how does the circumference relate to, say, the diameter. And if you're not really used to the diameter, it's very easy to figure out how it relates to the radius.
Radius & diameter from circumference - Khan Academy
Sal finds the radius and diameter of a circle given the circumference. Video transcript - [Voiceover] Let's say that we know that the circumference of a circle is 49 pi.
Radius, diameter, & circumference - Khan Academy
Learn the relationship between the radius, diameter, and circumference of a circle.
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Radians as ratio of arc length to radius (video) | Khan Academy
Derive using similarity the fact that the length of the arc intercepted by an angle is proportional to the radius, and define the radian measure of the angle as the constant of proportionality. Created by Sal Khan.
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Learn how to find the radius and diameter from the circumference of a circle on Khan Academy.
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