Determine if the origin is contained inside a triangle.
Find how many Pythagorean triangles allow tiling with a perimeter < 100,000,000.
Investigating isosceles triangle for which the height and base length differ by one.
Find the value of p ≤ 1000 which produces the most integer right triangles.
Find the sum of the perimeters of all almost equilateral triangles with integral side lengths and area.