March 2013

03.03.13 - radii of touching circles

radii of touching circles

When the sum of the radii and the distance between the centres are equal, the circles touch externally. If the difference between the radii and the distance between the centres are equal, then the circles touch internally.

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    Quartz : iodine lamp - compact tungsten filament lamp designed to maintain its color temperature and light intensity throughout its working life.

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