A triangle is not said to be a right-angled triangle if its sides measure:
Answer & explanation
Correct answer: option 3
All are multiples of common triplets except option 3:
i) 1.5, 2, 2.5 = 0.5 × (3, 4, 5)
ii) 18, 24, 30 = 2 × (9, 12, 15)
iii) 20, 21, 28 = (20, 21, 29)
iv) 2.5, 6, 6.5 = 0.5 × (5, 12, 13)
Hence, option 3, is not sides of right-angled triangle.