Question

In a right angled triangle, two sides are 9 cm and 12 cm. Then, the hypotenuse will be:

• A. 14 cm
• B. 10 cm
• C. 15 cm
• D. 13 cm

Answer 1

The correct option is C 15 cm

Consider a right-angled triangle ABC.


By Pythagoras' theorem,
$A{C}^2=A{B}^2+B{C}^{2}A{C}^2={12}^2+9^{2}A{C}^2=225AC=\sqrt{225}=15\text{cm}$
Hence, the hypotenuse is 15 cm.