New posts in triangles

Similar triangle inside large triangle split by incenter

geometry triangles

Calculating circle radius from two points on circumference (for game movement)

geometry circles triangles

Number of isoceles triangles formed by the vertices of a polygon that are not equilateral

combinatorics combinations triangles polygons

Heronian triangle Generator

linear-algebra geometry algorithms diophantine-equations triangles

Area of the given triangle

geometry triangles

How to find measurements of angle CBD?

geometry triangles angle

"Inverse" of the inscribed angle theorem

geometry triangles circles

Finding the third side of a triangle given the area

find the maximum possible area of $\triangle{ABC}$

calculus geometry optimization triangles area

In Triangle, $\sin\frac A2\!+\!\sin\frac B2\!+\!\sin\frac C2\!-\!1\!=\!4\sin\frac{\pi -A}4\sin\frac{\pi -B}4\sin\frac{\pi-C}4$

algebra-precalculus trigonometry triangles

Eritrea's Theorem

geometry euclidean-geometry triangles

Angles satisfying $(\cos\theta,\sin\theta)=(\frac{\sqrt a }{\sqrt{a+b}},\frac{\sqrt b}{\sqrt{a+b}})$ for integer $a$, $b$

geometry trigonometry triangles angle

What is the Lemoine point useful for?

geometry triangles

equilateral triangle; $3(a^4 + b^4 + c^4 + d^4) = (a^2 + b^2 + c^2 + d^2)^2.$

geometry algebra-precalculus contest-math triangles symmetry

Condition of existence of a triangle

geometry inequality euclidean-geometry analytic-geometry triangles

A geometric inequality, proving $8r+2R\le AM_1+BM_2+CM_3\le 6R$

geometry inequality triangles geometric-inequalities

Prove triangle area formula for barycentric coordinates

geometry triangles barycentric-coordinates

The case of Captain America's shield: a variation of Alhazen's Billard problem

geometry trigonometry algebraic-geometry recreational-mathematics triangles

Can we consider 3 triangles in case of congruency

Pythagorean Theorem for imaginary numbers