prove that using 10 coins is enough to cover any 10 points in a plane
140364
Covering ten dots on a table with ten equal-sized coins: explanation of proof
68882
Path to Combinatorics Problem [$1.11$]
22856
Ways to go from A to B(proof)
154564
Prove that the sum of minimum edge cover and maximum matching is the vertex count
57647
Prove that s is finite and find an n so large that $S_n$ approximate s to three decimal places.
125263
How to crack the proof
156850
Fix-Point Theorem Proof.
115801
Show that four points given by vectors lay on a circle
132070
A challenge on the parabola
149585
Game with 37 diagonally-oriented holes, 10 black pegs and 10 white pegs
117020
Regular $n$-gon in the plane with vertices on integers?
134652
Prove that the perpendicular bisectors of the sides of a triangle meet at a point
13420
$10$ Equations in $10$ variables
130436
bisectors of an angle in a triangle intersect at a single point - proof verification
44394
Coloring a $10×10$ grid
104309
Pigeon-Hole Principle Common Sum
149435
Arrange 10 points on five lines where each line(intersecting) has exactly 4 points