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  • Coaxal Circles

    Activity

    user3208

  • Squares in Arbelos

    Activity

    user3208

  • Squares in Arbelos

    Activity

    user3208

  • Archumedes Book of Lemmas, Lemma 5

    Activity

    user3208

  • Golden ratio in pentagons

    Activity

    user3208

  • Spira Mirabilis

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    user3208

  • From Perpendicular Center Lines To Concyclic Points

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    user3208

  • Construction: line parallel to a given one through a given point

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    user3208

  • Excircles in Trapezoid

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    user3208

  • Radius Of Circle By Paper Folding

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    user3208

  • Concurrence in right triangle

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  • Incircle and circumcircles

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  • Circumcenter on angle bisector

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  • Bottema's Point Sibling

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  • Kiepert friendship

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    user3208

  • Circles with equal collinear chords

    Activity

    user3208

  • Unknown sangaku

    Activity

    user3208

  • Desargues' theorem

    Activity

    user3208

  • Maximum perimeter property of the incircle

    Activity

    user3208

  • Building a Bridge

    Activity

    user3208

  • Problem 1 from the EGMO2017

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    user3208

  • Five circles in square

    Activity

    user3208

  • Conjugate diameters in ellipse

    Activity

    user3208

  • Angle classification

    Activity

    user3208