The Total solution for NCERT class 6-12
In right angled ∆ABC, we haveBC2 + (7)2 =(25)2 (By Pythagoras property)⇒ BC2 + 49 = 625⇒ BC2 = 625 – 49⇒ BC2 = 576∴ BC == 24 cm
Thus, the required length of BC = 24 cm.