New posts in plane-geometry

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

geometry euclidean-geometry plane-geometry

Packing of parallelograms with sides $1$ and $\sqrt{2}$ and angle $45^{\circ}$ in a rectangular container

geometry contest-math plane-geometry packing-problem

Do planes in multi-dimensional spaces rarely interact?

geometry analytic-geometry plane-geometry

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

euclidean-geometry triangles elliptic-curves plane-geometry

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

geometry euclidean-geometry plane-geometry

Torricelli points on a circle

geometry triangles circles plane-geometry

What's the measure of the $\angle POB$ in the circle below?

geometry euclidean-geometry plane-geometry

What's the power of point $P $ in relation to the center the circumference $O2$?

geometry euclidean-geometry plane-geometry

Number of triangles $\Delta ABC$ with $\angle{ACB} = 30^o$ and $AC=9\sqrt{3}$ and $AB=9$?

geometry algebra-precalculus trigonometry triangles plane-geometry

What's the value of the area of the triangle $ABC$ below?

geometry euclidean-geometry plane-geometry geometric-construction geometric-transformation

If the inradius is $2$ and the segments determined by the circumference inscribed on one side measure $3$ and $5$, find the area of triangle

geometry euclidean-geometry plane-geometry geometric-construction

What´s the value of the area of the triangle below?

geometry euclidean-geometry plane-geometry

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

geometry euclidean-geometry triangles circles plane-geometry

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

geometry 3d plane-geometry

Area of an irregular polygon

area polygons plane-geometry

Maximal tiling without any 3-in-a-rows

tiling plane-geometry

Locus of the points on complex plane

complex-analysis complex-numbers plane-curves plane-geometry

What's the area of the isosceles trapezoide below?

geometry euclidean-geometry plane-geometry

Inside /outside test of the point on 2D plane

differential-geometry euclidean-geometry analytic-geometry coordinate-systems plane-geometry

How to prove this general result on tucker circle?

euclidean-geometry plane-geometry