Question

What is the are of a triangle if the B=12
and the H=4?

Answer 1

24 units because 12*4=48 and 48/2=24

Answer 2

A=B*H/1/2

So you would multiply the Base times Height 
so you should do this 
12x4=48
1/2 of 48 is 24
so the area is 24