__Definition of Pythagorean Triples__

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The name is derived from the Pythagorean theorem, stating that every right triangle has side lengths satisfying the formula

But where did the Pythagorean Triples come from. Let us look at the history.

**Pythagorean triple**, named after Pythagoras, consists of three positive integers*a*,*b*, and*c*, such that*a*2 +*b*2 =*c*2. Such a triple is commonly written (*a*,*b*,*c*), and a well-known example is (3, 4, 5). If (*a*,*b*,*c*) is a Pythagorean triple, then so is (*ka*,*kb*,*kc*) for any positive integer*k*. A**primitive Pythagorean triple**is one in which*a*,*b*and*c*are coprime.The name is derived from the Pythagorean theorem, stating that every right triangle has side lengths satisfying the formula

*a*2 +*b*2 =*c*2; thus, Pythagorean triples describe the three integer side lengths of a right triangle. However, right triangles with non-integer sides do not form Pythagorean triples. For instance, the triangle with sides*a*=*b*= 1 and*c*= √2 is right, but (1, 1, √2) is not a Pythagorean triple because √2 is not an integer. Moreover, 1 and √2 do not have an integer common multiple because √2 is irrational. There are 16 primitive Pythagorean triples with*c*≤ 100. Can you figure out what the 16 primitive Pythagorean triples with c ≤ 100 are?But where did the Pythagorean Triples come from. Let us look at the history.