Proof that the perpendicular bisectors of the sides of a general triangle meet at a point
134652
Prove that the perpendicular bisectors of the sides of a triangle meet at a point
56320
Prove that the circumradius of $\triangle PAB$ is constant
67383
Prove that $G'$ is not planar.
112896
Construct the triangle with given angle bisectors
88555
About the point $P$ inside a square $ABCD$ satisfying $BP = BC$ and $\angle APD = 90^\circ$
106327
Prove, in this figure, that $EFGH$ is a parallelogram
48339
A triangle with vertices on the sides of a square, with one at a midpoint, cannot be equilateral
88605
Proof of the Reverse Triangle Inequality
158727
Leg bisectors in a trapezoid and angle equality
148169
prove that line bisect section
129002
Number of triangles formed by $m$ lines
126561
Proof of equivalence of algebraic and geometric dot product?
59644
Proof of Cartesian product intersection
15365
Proving that the triangle inequality holds for a metric on $\mathbb{C}$
69800
Construction of a right triangle
89493
Prove that circumcentre of $ABH,BCH,CAH$ are the vertices of a triangle congruent to $ABC$
53499
Equilateral triangle inscribed in a triangle