New posts in geometry

Relation between incentre of a triangle and a circle touching its two sides and circumcircle

geometry euclidean-geometry triangles circles plane-geometry

Locus of centre of circle

geometry algebra-precalculus

How degree of freedom of lines in 3D space is 4?

geometry 3d plane-geometry

N gunmen in a field

combinatorics geometry contest-math extremal-combinatorics

Finding the area of the shaded square inside a square created by connecting point-opposite midpoint [closed]

geometry euclidean-geometry area rotations quadrilateral

Distribute a fixed number of points "uniformly" inside a polygon

geometry

Banach-Tarski theorem without axiom of choice

geometry set-theory axiom-of-choice

Finding equation of an ellipsoid

geometry analytic-geometry

How to find the vector equation of a plane given the scalar equation? [closed]

linear-algebra geometry vector-spaces 3d

Number of points on a line in a finite projective plane

geometry algebraic-geometry projective-geometry projective-space

What is a left-invariant Vector field? [closed]

geometry algebraic-geometry

Prove the lines are concurrent (using vectors)

linear-algebra geometry vectors

A convex polyhedron has triangular and quadrilateral faces meeting four to a vertex. Prove the number of triangles is always the same; find the number

general-topology geometry polyhedra

How to prove that the tangent to a circle is perpendicular to the radius drawn to the point of contact?

geometry circles

High school geometry proof help

geometry

Orientability of $\mathbb{RP}^3$

geometry intuition projective-space

Does $a^2+b^2=1$ have infinitely many solutions for $a,b\in\mathbb{Q}$?

geometry arithmetic diophantine-equations

How to test if a line segment intersects an axis-aligned rectange in 2D?

graphics geometry 2d

Showing That Points Are Concyclic

geometry analytic-geometry circles

When are angles negative?

geometry