Incenter
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What links here
Orthocenter
Isosceles triangle
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Euler line
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Cyclic quadrilateral
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Centroid
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Olry Terquem
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Orthocentric system
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Nine-point circle
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Incircle and excircles
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Pedal triangle
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Perpendicular
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Straightedge and compass construction
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Right triangle
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Triangle
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Quadrilateral
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Carl Friedrich Gauss
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