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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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| At a 6,000-foot firing range, the T-72 is barely wider than the two milliradian aiming index of the A-10 sight (2. For purposes here, the radiant intensity has been integrated over the vertical angle of emission, which at 100 nm is about 4 milliradians (full-width at half-maximum intensity). 2 milliradians in Theta axis, to meet the most stringent MEMS applications. |
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