Answer: Triangle C.
Explanation:
We can find the area of the triangles by multiplying the base by the height and dividing by 2. The given formula is A = 
.
 A = 

 B = 

 C = 

 D = 

 E = 

We can see that the triangle with the different area is triangle C. It has an area of 1.5 units², while the rest have an area of 2 units².