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New posts in Euclidean Geometry
(BAMO $2013/3$) $ABH$, $BCH$ and $CAH$ is congruent to $ABC$.
May 09, 2021
$\triangle ABC$ with a point $D$ inside has $\angle BAD=114^\circ$, $\angle DAC=6^\circ$, $\angle ACD=12^\circ$, and $\angle DCB=18^\circ$.
May 09, 2021
Minimizing the sum of the six distances determined by four points in the plane, if each distance is at least $d$
May 09, 2021
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.
May 09, 2021
Book recommendations for Euclidean/Non-Euclidean Geometry
May 09, 2021
Rotating a quarter circle -- how long has a point traveled.
May 09, 2021
Through two given points on a circle, construct two parallel chords with a given sum.
May 09, 2021
Coordinate proof that the sum of a triangle's angles is $180^\circ$?
May 09, 2021
Ratio of area covered by four equilateral triangles in a rectangle
May 09, 2021
A problem concerning a parallelogram and a circle
May 09, 2021
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