Showing what's behind the curtain

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 only Pythagorean triplet, {a, b, c}, for which a + b + c = 1000.

Find the value of p ≤ 1000 which produces the most integer right triangles.

Count the different lengths of wire that can form a right angle triangle in only one way.

Find the sum of the perimeters of all *almost equilateral triangles* with integral side lengths and area.