New posts in triangles

Does a triangle always have a point where each side subtends equal 120° angles?

geometry trigonometry euclidean-geometry triangles

If $J$ is tangent point of $GH$ with incircle of $FGH$ and $D$ is intersection of $F$-mixtilinear inclrcle with $(FGH)$, then $\angle FGH=\angle GDJ$.

geometry euclidean-geometry triangles circles plane-geometry

In any triangle, $b^2\sin(2\gamma)+c^2\sin(2\beta)=2ac\sin(\beta)$

triangles

Sangaku - Find diameter of congruent circles in a $9$-$12$-$15$ right triangle

geometry euclidean-geometry triangles circles sangaku

Maximum area of a triangle

geometry trigonometry triangles

Is it possible to have two triangles with equal sides but with different angles?

geometry triangles

Sangaku: Show line segment is perpendicular to diameter of container circle

geometry euclidean-geometry triangles circles sangaku

calculating the Fermat point of a triangle

geometry algorithms triangles

Determinant formula for coordinates of circumcenter and orthocenter of a triangle

linear-algebra geometry triangles analytic-geometry

what's the name of the theorem:median of right-triangle hypotenuse is always half of it

geometry triangles median

Incircle Right Triangle Proof

geometry triangles circles

The Ellipse Problem - finding an ellipse inside a triangle

geometry conic-sections triangles

A curious triangle inequality

geometry inequality triangles geometric-inequalities

The Notorious Triangle Problem

analysis contest-math triangles functional-equations

Angles of a triangle - are in a Geometric Progression, possible values for the common ratio other than 1 [closed]

triangles geometric-progressions

Prove that: $ m_a + m_b + m_c \le 4R + r $

inequality polynomials circles triangles geometric-inequalities

What is the maximum area of a square inscribed in an equilateral triangle?

optimization triangles area maxima-minima quadrilateral

Find all triangles of which perimeter and area are numerically equal

geometry analytic-geometry triangles area

Condition on sides of triangle to proof it is isoceles

inequality triangles

6th Grade (12 Years Old) Mathematics - Triangle Inequality Question

inequality triangles