Midpoint
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What links here
Altitude (triangle)
Isosceles triangle
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Golden rectangle
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List of numbers
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Euler line
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Heron's formula
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Summer Triangle
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Incircle and excircles
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Nine-point circle
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Orthocenter
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Law of sines
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Right triangle
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Similarity (geometry)
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Triangle
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Length
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Harmonic mean
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Carl Friedrich Gauss
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