Difficulty "Easy"? Seriously? That's deliberate misinformation.

It's HARD. The gyst of the problem is to find triangles where:

a. all sides are integer numbers, and

b. all 3 distances from the angles to the Torricelli point is also whole numbers (not fractional numbers).

For that you need to apply Law of cosines to 120-degree triangles, that would give you equasions like that:

c^2 = p^2+r^2 + pr

Considering p, r, and c are integer numbers, you need to build a collection of pairs (p, r) where p^2+r^2 + pr would give you a square number.

Building this collection is not trivial, here's a useful article on that: http://www.geocities.ws/fredlb37/node9.html

What are the criteria for labelling this problem Easy. This is one of the hardest based on number of people that solved it on Project Euler and probably the hardest out of the first 150.

I CAN'T UNDERSTAND THE QUESTION?IS ANYONE CAN HELP ME!!!