Round and Round
情報源: Futility Closet ·
With a pair of compasses, draw a circle on a plane. Then, without changing the width of the compasses, draw a circle on a sphere. Surprisingly, the areas of the planar disk and the spherical cap are equal.
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Round and Round is a ウェブサイト discovery curated from Futility Closet. With a pair of compasses, draw a circle on a plane. Then, without changing the width of the compasses, draw a circle on a sphere. Surprisingly, the areas of the planar disk and the
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Word of the day for November 6
edit · refresh · view Word of the day for November 6 sax n ( music , informal ) Clipping of saxophone . Clipping of saxophonist . sax v ( music , informal ) ( transitive ) Followed by the dummy pronoun it : to play the saxophone . ( intransitive ) To play the saxophone. sax n ( weaponry , obsolete except historical ) A short sword used by Germanic peoples , especially the Saxons , from about the 4th to 10th centuries ; a type of dagger ; a seax ; also, a type of knife or machete used as a cutting tool by these peoples. ( by extension ) A tool, similar to a hatchet , with an edge for cutting sl