Question

In the given figure, if a = 9 cm and b = 12 cm, then c = ___

• A. 10 cm
• B. 12 cm
• C. 15 cm
• D. 20 cm

Answer 1

The correct option is C

15 cm

Using Pythagoras theorem we have, $c^2=a^2+b^2$

$c^2=9^2+{12}^2$

$c^2=81+144$

$c^2=225$

$c^2={15}^2$

$c=15cm$

Hence (C)

Aid to memory-

3-4-5 Pythagoras Triplet