• ### The sum of the lengths of the radiuses of circles inscribed in an equilateral triangle

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• ### The sum of the lengths of segments on the sides of an equilateral triangle

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• ### Segments in an equilateral triangle

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• ### Segments in an equilateral triangle

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• ### Segments in an equilateral triangle

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• ### Segments in an equilateral triangle

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• ### The minimum value of the sum of the lengths of the hypotenus

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• ### The maximum area of some triangle(stage b).

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• ### The maximum area of some triangle(stage a).

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• ### : The sum of the distances is minimal(stage b).

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• ### The sum of the distances is minimal(stag a)

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• ### Morley triangle with a maximum relative area.

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• ### Triangle with a maximum area

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• ### The loci formed by the intersection point of the angle bisec

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• ### The loci formed by the intersection point of the angle bisec

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• ### An applet for demonstrate the loci formed by the intersectio

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• ### An applet for demonstrate the loci formed by a point on slid

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• ### The loci formed by the intersection point of the medians of

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• ### The loci formed by the intersection point of the angle bisec

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• ### The loci formed by the intersection point of the altitudes

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• ### Applet for demonstrating Van Aubel's theorem for quadrilater

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• ### Applet for demonstrating Napoleon's theorem for triangle

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• ### : Applet for demonstrating Steiner’s theorem for trapezoid

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• 