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radian |
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radian an SI unit of plane angle; the angle between two radii of a circle that cut off on the circumference an arc equal in length to the radius. 1 radian is equivalent to 57.296 degrees and π/2 radians equals a right angle radian [′rād·ē·ən] (mathematics) The central angle of a circle determined by two radii and an arc joining them, all of the same length. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| This measurement system, the HP E1710A, offers the highest resolution available today -- eight nanoradians -- for measuring and controlling angular position in disk-drive manufacturing. |
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