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In geometry, the incircle of the medial triangle of a triangle is the Spieker circle, named after 19th-century German geometer Theodor Spieker. Its center, the Spieker center, in addition to being the incenter of the medial triangle, is the center of mass of the uniform-density boundary of triangle. The Spieker center is also the point where all three cleavers of the triangle (perimeter bisectors with an endpoint at a side's midpoint) intersect each other.

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  • Spieker circle
  • Cirkel van Spieker
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  • De cirkel van Spieker is een bijzondere cirkel in een driehoek. Het is het complement van de ingeschreven cirkel. Deze cirkel is zowel ingeschreven in de driehoek van de middens van de zijde, als in het beeld van ABC bij vermenigvuldiging ten opzichte van het punt van Nagel met factor .
  • In geometry, the incircle of the medial triangle of a triangle is the Spieker circle, named after 19th-century German geometer Theodor Spieker. Its center, the Spieker center, in addition to being the incenter of the medial triangle, is the center of mass of the uniform-density boundary of triangle. The Spieker center is also the point where all three cleavers of the triangle (perimeter bisectors with an endpoint at a side's midpoint) intersect each other.
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  • De cirkel van Spieker is een bijzondere cirkel in een driehoek. Het is het complement van de ingeschreven cirkel. Deze cirkel is zowel ingeschreven in de driehoek van de middens van de zijde, als in het beeld van ABC bij vermenigvuldiging ten opzichte van het punt van Nagel met factor .
  • In geometry, the incircle of the medial triangle of a triangle is the Spieker circle, named after 19th-century German geometer Theodor Spieker. Its center, the Spieker center, in addition to being the incenter of the medial triangle, is the center of mass of the uniform-density boundary of triangle. The Spieker center is also the point where all three cleavers of the triangle (perimeter bisectors with an endpoint at a side's midpoint) intersect each other.
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