Question

find the length of AB..​

Answer 1

Answer:

the lenght of AB is 3 cm i.e. option (b)

Answer 2

Answer:

b) 3cm

Step-by-step explanation:

As

angC=angA

so

AngB=90

by Pythagoras theorem,

We get

Ac^2=Ab^2+Bc^2

Ab^2=Ac^2-Bc^2

ab^2= 5^2-4^2

Ab= √9

Ab= 3cm