New posts in euclidean-geometry

What would you see inside a spherical mirror?

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Regular polygons constructed inside regular polygons

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Another chain of six circles

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What's the measure of the radius of the biggest circle below?

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proving an equality in euclidean geometry

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Chebyshev center = center of mass?

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Mysterious ratio

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What is a geometric construction corresponding to elliptic curve addition for Sharygin-isosceles triangles?

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Pythagoras Theorem Proof

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Calculate area of polygon inside unit square

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What is the value of segment AB in the quadrilateral of the question below?

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Convexifying a Concave Polygon by Reflections

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Why does the Pythagorean Theorem have its simple form only in Euclidean geometry?

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Find the power of $P$ in relation the center circumference $O$ below.

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History of Compass/Straight Edge Construction

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Rationale for a convention: Why use the semiperimeter in Heron's formula?

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Concentric Equilateral Triangles

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Regular polygon inside another?

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Rigorous books on geometry

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Locus of points equidistant to three spheres

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