Answer of the Qtn.

BC = 5cm

AC +AB= 25cm     ----- (1)

We know that

AC² = AB² + BC²

From (1)

AC = 25 – AB

Or, AC² = (25 – AB) ²

Put this value in formula

(25-AB)² = AB² + BC²

625 + AB² - 50AB = AB² + 25

652 – 50AB = 25

-50AB  =  25 – 625

50AB = 600

AB = 12cm

Now  AC+AB = 25

Than  AC + 12 = 25

AC = 25-12

AC = 13cm

 Now We have

AC = 13cm

AB = 12cm &

BC = 5 cm