La Flèche Wallonne

A triangle is divided in four. What is the black area?

Scroll down for a solution to this problem.


The black area is 17.

Solution using mass point geometry by Dr Rick.

This solution uses the interesting technique of mass points. It basically assigns point masses to the vertices and calculates the centre of mass using cevian proportions. In this case the starting point is the 3 at the lower left corner. The other masses follow from the geometry.


La flèche wallonne
Course cycliste de choix
Passant par Namur et Charleroi
1ère édition, le favori Eloi
Perd la course , tombe et choit
Eddy Merckx en fut le plus grand roi.
En 2020 le covid fait la loi
Course remise à septembre comme il se doit
En 2021 Alaphilippe la gagna


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