A geometry question of quadrilateral.
124425
A geometry question: Let $ABCD$ be a convex quadrilateral. Prove that AD is parallel to BC.
78894
Product of square of distances from vertices of a polygon of radius a
110472
Existence of a Pivot Point in Euclidean Geometry
71975
Showing that an Isometry on the Euclidean Plane fixing the origin is Linear
126424
The square of minimum area with three vertices on a parabola
131919
Vertices of equilateral triangle inscribed in the unit circle
106485
Olympiad Geometry Problem
5836
Determining the general perpendicular normal
10772
Equilateral triangle inscribed in a ellipse
131209
Finding point coordinates of a perpendicular
48339
A triangle with vertices on the sides of a square, with one at a midpoint, cannot be equilateral
158162
Finding the volume of the tetrahedron.
131315
What geometric object is given by this equation?
88051
$\mathbb R = X^2$ as a Cartesian product
50051
Interpret geometrically the equation
88283
Proving the length of angle bisector
130278
Vector Applications in Euclidean Geometry