New posts in geometry

A Regular Tetrahedron is a cool Polyhedron.

geometry

What's the measure of the segment $PD$ in the pentagon below?

geometry euclidean-geometry plane-geometry

Overlapping circles covering polygon

geometry recreational-mathematics

Minimal Ellipse Circumscribing A Right Triangle

geometry euclidean-geometry analytic-geometry conic-sections plane-curves

Surface described by the equation $-3y^2 - 4xy + 2xz + 4yz - 2x - 2z + 1 = 0$

linear-algebra geometry surfaces quadratic-forms

What are the conditions for a polygon to be tessellated?

geometry algebraic-geometry intuition tessellations

Shadow time for a satellite on an inclined orbit

geometry euclidean-geometry dynamical-systems

Transfer coordinates from one triangle to another triangle

coordinate geometry

How can I find the smallest enclosing circle for a rectangle?

geometry circles

Prove triangle area formula for barycentric coordinates

geometry triangles barycentric-coordinates

Area of a circle $\pi r^2$

geometry circles area pi

What is the difference between intrinsic and extrinsic curvature?

general-relativity differential-geometry curvature geometry

Is there a simple perfect squaring of a 1366 by 768 rectangle?

geometry geometric-construction rectangles tiling art

If $AB\parallel DC$, $BC\parallel AD$, and $AC\parallel DQ$, find $\Bbb X$ in terms of the areas $\Bbb A$, $\Bbb B$, and $\Bbb C$.

geometry euclidean-geometry area plane-geometry polygons

What's the measure of the segment HD in the pentagon below?

geometry euclidean-geometry plane-geometry

Why is the area of a circle expressed in $\pi r^2$? [duplicate]

geometry euclidean-geometry

Is vector geometry useful within economics?

geometry vectors finance economics

A bound for $\sqrt\frac{b+c-a}a+\sqrt\frac{c+a-b}b+\sqrt\frac{a+b-c}c$ in a triangle

geometry inequality contest-math geometric-inequalities

A circle is divided into $5$ parts as shown in the diagram and parts are colored either red or green. Find which area is bigger.

geometry trigonometry euclidean-geometry area

Prove two angles equal in billiard scenario.

geometry euclidean-geometry