Are the numbers 1

We know that the numbers which are satisfying the Pythagoras theorem are called the Pythagorean triplets.

We know that in a right-angled triangle, the square of the hypotenuse is equal to the sum of the squares of the other two sides.

In ΔPQR,

⇒ QR² = PQ² + PR²

⇒ 13² = 12² + 5²

⇒ 169 = 144 + 25

∴ 169 = 169

Since the above numbers satisfy the Pythagoras Theorem, 15, 5 and 13 form a Pythagorean Triplet.