About the point $P$ inside a square $ABCD$ satisfying $BP = BC$ and $\angle APD = 90^\circ$
88555
About the point $P$ inside a square $ABCD$ satisfying $BP = BC$ and $\angle APD = 90^\circ$
134652
Prove that the perpendicular bisectors of the sides of a triangle meet at a point
73799
In a convex Quadrilateral ABCD, $\measuredangle ABC = \measuredangle BCD = 120^{\circ}$.Prove that: $ AC + BD \ge AB + BC + CD$
101734
$7$ points inside a circle at equal distances
66610
Finding a correspondence between $\{0,1\}^A$ and $\mathcal P(A)$
35751
Is There a Problem with This Professor's Proof Concerning Interior and Boundary Points?
67514
Formal Proof that area of a rectangle is $ab$
56320
Prove that the circumradius of $\triangle PAB$ is constant
113454
Find the locus of this point P
49087
Show that a norm on an inner product space satisfies parallelogram law.
12764
$\Bbb RP^2$ as the union of a Möbius band and a disc
67460
Orientation on $\mathbb{CP}^2$
118766
For $A_1 A_2\cdots A_{11}$ a regular $11$-gon with circumradius $2$, and point $P$ at distance $3$ from the center, find $\sum PA_k^2$
118716
If $ABCD$ is a cyclic quadrilateral, then $AC\cdot(AB\cdot BC+CD\cdot DA)=BD\cdot (DA\cdot AB+BC\cdot CD)$
93948
Is my proof correct? $p_1p_2p_3\cdots p_n+1)$ cannot be the square of an integer
94019
Find all $p$'s such that $p^4 + p^3 + p^2 + p +1$ is a perfect square.
145752
Aut $\mathbb Z_p\simeq \mathbb Z_{p-1}$