Question

pls anybody write correct answer​

Answer 1

let BC be x cm

in rt. triangle ABD

=> AB² + BD² = AD²

=> AB² + (11+x)² = 20²

=> AB² + 121 + 22x + x² = 400

=> AB² + 22x + x² = 279

=> AB² = - x² - 22x + 279

in rt. triangle ABC

=> AB² + BC² = AC²

=> - x² - 22x + 279 + x² = 13²

=> -22x = 169 - 279

=> - 22x = - 110

=> x = 5 cm

BC = 5 cm and BD = 5 + 11 = 16 cm

AB = 12 cm