Barycentric coordinate system
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Semiperimeter
Feuerbach point
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Descartes' theorem
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Isosceles trapezoid
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Concyclic points
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Midpoint
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Incenter
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Isosceles triangle
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Brahmagupta
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Trapezoid
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Heron's formula
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Cyclic quadrilateral
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Brahmagupta's formula
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Rhombus
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Altitude (triangle)
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Incircle and excircles
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Law of sines
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Triangle inequality
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Right triangle
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Triangle
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Pythagorean triple
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Pi
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Perimeter
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History of geometry
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Semi-perimeter
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