Question

What is the area of triangle LMN? Round to the nearest square meter.

Answer 1

The answer is 9 square meters.

Answer 2

Here I think the given data was LM=7,MN=6 and perimeter was given by 16m 
As we know perimeter is the sum of all the sides  
so Perimeter=LM+MN+NL 
NL=Perimeter-(LM+MN) 
NL=16-7-6 
NL=3 
By Heron's formula 
Area=sqrt(s(s-a)(s-b)(s-c)).  
where s=perimeter/2 
so s=16/2=8 
area=sqrt(8(8-7)(8-6)(8-3)) 
area=8.94427191 
after rounding off 
area=9