New posts in euclidean-geometry

Is Euclid's Fourth Postulate Redundant?

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Geometry Question: proving that NM and MC are perpendicular

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How many 1-balls are needed to cover the 2-ball in an $n$-dimensional Euclidean Space?

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Locating three sets of collinear points

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Find the area of ​region ABC.

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Making a convex polyhedron with two sheets of paper

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Sangaku. How to draw those three circles with only a ruler and a compass?

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A circle tangent to an ellipse

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A chain of six circles associated with a cyclic hexagon

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Construct tangent to a circle

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Find the area of region ABC below

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Does the notion of "rotation" depend on a choice of metric?

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What is the name of the circle that is tangent to three mutually-tangent circles centered at the vertices of a triangle?

geometry euclidean-geometry soddy-circles

Which area is larger, the blue area, or the white area?

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Do any books or articles develop basic Euclidean geometry from the perspective of "inner product affine spaces"?

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If any triangle has area at most 1 , points can be covered by a rectangle of area 2.

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Finding a missing angle in the picture containing regular hexagon and square

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Spheres cause contradictions in dimensions $10$ and more?

geometry euclidean-geometry spheres paradoxes

What's the connection the ratio of the arithmetic progression to the area of the triangle below?

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Is the ratio of the side and at least one diagonal of a rhombus always irrational?

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