New posts in euclidean-geometry

How many lines bisect both perimeter and area of a 3-4-5 triangle?

geometry euclidean-geometry

Prove that the incircle is the smallest circle which passes through the three sides of a triangle

geometry euclidean-geometry

Gödel's (in)completeness theorems and the axiomatization of Euclidean geometry

euclidean-geometry axioms incompleteness

Mathematics and the art of linearizing the circle

modular-arithmetic euclidean-geometry projective-geometry visualization art

How many isosceles, right-angled, INSCRIBED triangles exist in an ellipse?

geometry euclidean-geometry triangles

Find a circle orthogonal to two other circles

geometry euclidean-geometry circles

Fit a equilateral triangle on three arbitrary parallel lines with an edge and compass

euclidean-geometry

Is this really an open problem? Maximizing angle between $n$ vectors

geometry reference-request euclidean-geometry open-problem

Prove the sum of intern angles of a quadrilateral is equal to 360º

geometry euclidean-geometry

Why Euclidean geometry cannot be proved incomplete by Gödel's incompleteness theorems?

logic euclidean-geometry incompleteness

Given $\triangle ABC$ isosceles with base AB, M and N the midpoints of the equal sides. Show the reflection of C is the midpoint of AB

geometry proof-explanation euclidean-geometry triangles

Geometry Construction Problems

geometry euclidean-geometry geometric-construction

Why the surface of the sphere is not a Euclidean space?

manifolds euclidean-geometry

Why the interest in locally Euclidean spaces?

geometry differential-geometry euclidean-geometry

What does Heron's formula naturally deform?

combinatorics euclidean-geometry symmetric-groups symmetric-polynomials symmetric-functions

:Find the area of ​the shaded region $ABC$ in the figure below

geometry euclidean-geometry plane-geometry

Prove the diagonals of rhumbus are perpendicular and angles bisector

geometry solution-verification proof-explanation euclidean-geometry triangles

Find the angles of given triangle ABC

geometry euclidean-geometry triangles plane-geometry angle

Find the area of ​the triangular region KHQ,

geometry euclidean-geometry triangles alternative-proof plane-geometry

Angles of triangle $\triangle XYZ$ do not depend on the position of point $P$ (proof needed)

geometry euclidean-geometry triangles quadrilateral geometric-transformation