Question

In ABC ∆C= 90° AB = 5 cm, AC=4cm. Find BC=?
(1) 3 cm
(2) 5 cm
(3) 4 cm
(4) 9 cm​

Answer 1

Step-by-step explanation:

given

AC = 4cm

AB = 5cm

let required length of BC be x

by using Pythagoras theorem

${h}^{2} = {b}^{2} + {p}^{2}$

${5}^{2} = {x}^{2} + {4}^{2}$

$25 = {x}^{2} + 16$

${x}^{2} = 25 - 16$

$x = 3$

BC = 3 cm (answer)