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The characterization of an ellipse as the locus of points so that sum of the distances to the foci is constant leads to a method of drawing one using two drawing pins, a length of string, and a pencil. In this method, pins are pushed into the paper at two points, which become the ellipse's foci.
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On a bowed string instrument, the note is played while drawing the bow upward. On a plucked string instrument played with a plectrum or pick (such as a guitar played pickstyle or a mandolin), the note is played with an upstroke. Down bow or Giù arco In contrast to the up bow, here the bow is drawn downward to create sound.
Likewise, a tool that can draw any ellipse with already constructed foci and major axis (think two pins and a piece of string) is just as powerful. [16] The ancient Greeks knew that doubling the cube and trisecting an arbitrary angle both had solid constructions.
The pins-and-string construction of an ellipsoid is a transfer of the idea constructing an ellipse using two pins and a string (see diagram). A pins-and-string construction of an ellipsoid of revolution is given by the pins-and-string construction of the rotated ellipse. The construction of points of a triaxial ellipsoid is more complicated.
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An oval with two axes of symmetry constructed from four arcs (top), and comparison of blue oval and red ellipse with the same dimensions of short and long axes (bottom). In technical drawing , an oval is a figure that is constructed from two pairs of arcs, with two different radii (see image on the right).
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