Which of the following can form the three sides of a right-angled triangle?
AB+BC+CA = 2 AM
3, 4, 5 form a Pythagorean triplet i.e. the sum of the squares of 3 and 4 equals the square of 5. Apart from this combination, none can form a right-angled triangle as they do not make up a Pythagorean triplet.