Does the set 16,20,25 represent a Pythagorean triple?

NO

Step-by-step explanation:

If a ≤ b ≤ c represent a Pythagorean triple, then

a² + b² = c²

We have a = 16, b = 20 and c = 25. Substitute:

L = 16² + 20² = 256 + 400 = 626

R = 25² = 625

L ≠ R

A pythagorean theorem must satisfy a² + b² = c²

16² + 20² = 25²

256 + 400 = 625

656 ≠ 625 so no, the set 16, 20, 25 does not represent a pythagorean triple