Correct Answer: (d) 24 cm

Explanation:

In triangle ABC,

Let the altitude from A on BC meets BC at D.

AD = 5 cm

AB = 13 cm

D is the midpoint of BC

Applying Pythagoras theorem in right-angled triangle ABD,

????????² = ????????² + ????????²

????????² = ????????² − ????????²

????????² = 13² − 5²

????????² = 169 − 25

????????² = 144

???????? = √144 => 12 ????????

BC = 2BD => 24 cm