Rectilinear figures are those which are contained by straight lines, trilateral figures being those contained by three, quadrilateral those contained by four, and multilateral those contained by more than four straight lines.
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"The laws of nature are but the mathematical thoughts of God."
"Give him threepence, since he must make a gain out of what he learns."
"And that, if a straight line falling on two straight lines make the interior angles on the same side less than two right angles, the two straight lines, if produced indefinitely, meet on that side on …"
"If a straight line be cut in extreme and mean ratio, the greater segment is also cut in extreme and mean ratio by the lesser segment."
"To construct an equilateral triangle on a given finite straight line."
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