How can this "illegal geometry" problem be possible?
44098
How come $32.5 = 31.5$? (The "Missing Square" puzzle.)
31410
Why do the measurements of this object seem erroneous?
43183
basic geometry angle problem
23451
The new introduced EulerMatrix problem
83542
A natural problem in $\textrm{S}_2^\textrm{P}$?
78654
An example of a norm which can't be generated by an inner product
60795
Quadrilateral's area problem
102192
Can someone explain geometric multiplicity?
21013
Why are two identical objects not equal to each other?
143717
Why/How are there infinite points in a line segment?
9312
How dangerous is it to access an array out of bounds?
93635
Euclidean geometry in non-inertial frame
111042
A geometry problem from high school Olympiad selection round
48495
Is it possible to prove the independence of the parallel postulate without non-euclidean geometry?
87968
A strange puzzle having two possible solutions
147924
Math problems that are impossible to solve
66524
The Impossibility ( or Possibility) of Solving $N$-Body Problem