The area of a Triangle is 1/2BH (B=Base length, H=Height) When looking at the points, we can figure out the following:
The distance between the two points at the base is 8 (to get from -4 to 4 you must add 8) and the height is 4 (to get from -4 to 0 as well as 0 to 4, the distance is 4).
Now we plug in our values: Area= 1/2(8)(4) =1/2(32) =16 Units squared