Question

please solve it fast

Answer 1

s-A=3
s-B=2
s-C=1

Add all three
3s-(A+B+C)=6
3s-2s=6
s=6

By hero formula
Area of triangle
=(s× (s-A) ×(s-B) × (s-C))^1/2
=36^1/2
=6