The aim of this note is to prove that the area of every right-angled triangle is a multiple of 6, and
that the product of the lengths of all three sides, which I define as its “volume”, is a multiple of
60. The so–called cosmic triangle 4 = (3; 4; 5), has the smallest area of 6 squared units, while
its volume is 60 cubic units. It therefore follows that every Pythagorean triangle is the “sum” of
cosmic triangles. We highlight this fact in Table 1, on Pythagorean triples. We begin by quoting
Fermat’s Little Theorem, as this is integral to our proof.
Lemma 1 (Fermat’s Little Theorem). ap