Question

in the given figure angle 1 = angle 2 = angle 3 if AD is equal to 5 cm BC is equal to 4 cm and the perimeter of triangle ABC is 13 cm then the length of BE is

Answer 1

the perimeter of triangle= a+b+c 
therefore 5+4+BE= 13
13-9=4cm

Answer 2

AC=5cm
BC=4cm
Total perimeter of triangle ABC=13cm
Therefore,13-5+4=9cm
BE=9cm