Question

In ∆ABC AB=6cm , BC=7cm and it's perimeter is 18cm.Find the length of AC and what is its 'S'.

Answer 1

Length of AC = 18 - ( 6+7 )

                       = 18 - 13                      

                       = 5cm

Therefore length of AC = 5cm

Answer 2

Answer:

the answer is 5 and 9 respectively

Step-by-step explanation:

given

perimeter=18

AB+BC+CA=18

6+7+AC=18

AC= 18 - 13

AC=5

S= (AB+BC+AC)/2

S= 18/2

S= 9