One point on these figures can be determined by drawing lines from extouch points to vertices; that point is the Nagel point.
One point on these figures can be determined by drawing lines from extouch points to vertices; that point is the Nagel point. One formula describing these figures is a special case of Brahmagupta's Formula where one side is set to zero. Whether points lying on the sides of one of these figures are collinear can be determined by Menelaus' Theorem, which is paired with Ceva's Theorem. The Euler line passes through several points on one of these that isn't a regular polygon. The semiperimeter of one of these figures may be used to calculate the area in Hero's formula, though it may be easier to use one half times base times height. Name this polygon that has three sides.
One point on these figures can be determined by drawing lines from extouch points to vertices; that point is the Nagel point.
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