Does 21,28,35 form a pythagorean triple

Pythagorean Theorem: a² + b² = c²

If a² + b² is equal to c², then the set (21, 28, 35) form a Pythagorean triple

21² + 28² = 928

√928 = 30.46 ≠ c

Therefore (21, 28, 35) DOES NOT form a Pythagorean triple

21, 28, 35 is a Pythagorean triple because the lengths found in step 2 form a Pythagorean triple.