Find the Pythagorean triplets from among the following set of numbers :
2 cm, 4cm, 5cm

Explanation

`(2)^2=4, (4)^2=16, (5)^2=25`
`4+16=20ne25`
`therefore (2)^2+(4)^2ne(5)^2`
2,4 and 5 is not a Pythagorean triplet.