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A small circle rolling around a large circle | R
Everyone Got This SAT Math Question Wrong
http://qindex.info/d.php?c=5049#5231

One Mile South, One Mile West, One Mile North | R
Elon Musk's Favorite "Impossible" Riddle - One Mile South, One Mile West, One Mile North
http://qindex.info/d.php?c=5049#5133

South Korean Geometry Problem | R
VERY HARD South Korean Geometry Problem (CSAT Exam)
http://qindex.info/d.php?c=5049#5098

Triangles in a parallelogram | R
It was used to identify gifted kids for competition.
http://qindex.info/d.php?c=5049#5050

Triangles in a square | R
What Is The Area? "You Should Be Able To Solve This"
http://qindex.info/d.php?c=5049#5078
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