Triangle and square number
20548
General formula to obtain triangular-square numbers
116780
product is twice a square
15976
Smallest possible triangle to contain a square
114542
Can a number with $100$ $0$'s $100$ $1$'s and $100$ $2$'s ever be a perfect square?
130851
Squaring the plane, with consecutive integer squares. And a related arrangement
74505
3 square in a circle (geometric question)
84220
Questions on perfect squares
83493
Map an arbitrary triangle to the unit square
62518
How many rectangles or triangles.
20443
Calculate sum of squares of first $n$ odd numbers
107293
Triangle Notation in Spain
83910
Integer part of $\sqrt[3]{24+\sqrt[3]{24+\sqrt[3]{24+\cdots}}}$
142692
Point inside a square
83862
How to prove that the number $1!+2!+3!+...+n!$ is never square?
125702
There is a square $Q$ consisting of $(0,0), (2,0), (0,2), (2,2)$
26222
how can I find the Side length Two squares inside an equilateral Triangle?
149267
Complete the square on cross terms?