Question

The lengths 18 cm, 24 cm and 30 cm can form the sides of a right-angled triangle.

• A. 18 cm, 19 cm, 20 cm
• B. 18 cm, 25 cm, 32 cm

Answer 1

The correct option is A

18 cm, 19 cm, 20 cm

${18}^2+{24}^2=324+576=900={30}^2$

Since the squares of 18 and 24 add up to the square of 30, these form a Pythagorean triplet, and hence, can be used to represent the three sides of a right-angled triangle.