X The involute of the catenary is called the tractory, tractrix or antifriction curve; it has a cusp at the vertex of the catenary, and is asymptotic to the directrix. [Please select]
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The shapes they took as they plaited and wove themselves into one another were all involuted, everything turning itself inside out, and the end of every separate movement was blood-red. [Please select]
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Other kinds of vernation are _revolute_, the opposite of involute, where the leaf is rolled backwards towards the midrib; _circinate_, rolled from the apex downwards, as we see in ferns; and _corrugate_, when the leaf is crumpled in the bud. [Please select]
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