New posts in Triangles

How to calculate the area of $\triangle ABC$ when the distance from $BC$ to the circumcircle at $G$ is 10?

Suppose $\angle BAC = 60^\circ$ and $\angle ABC = 20^\circ$. A point $E$ inside $ABC$ satisfies $\angle EAB=20^\circ$ and $\angle ECB=30^\circ$.

(BAMO $2013/3$) $ABH$, $BCH$ and $CAH$ is congruent to $ABC$.

$\triangle ABC$ with a point $D$ inside has $\angle BAD=114^\circ$, $\angle DAC=6^\circ$, $\angle ACD=12^\circ$, and $\angle DCB=18^\circ$.

Coordinate proof that the sum of a triangle's angles is $180^\circ$?

Ratio of area covered by four equilateral triangles in a rectangle

A problem concerning a parallelogram and a circle

Find the angle $x$ in this triangle

Triangles and inequalities

Geometry Problem on $\triangle ABC$ and Angle Chasing