by Larry Rieck

(Canada)

Find the area of the triangle with vertices (-1,4), (-1,8), and (3,4)

Once you plot out the coordinates given, this triangle is revealed to be a right-angle triangle. We can thus apply the formula of calculating the area of a right-angle triangle:

From the coordinates, we can calculate the height and base of the triangle:

Now then, we can replace the variables with the information we have:

Therefore, the area of this triangle is

You can also refer to our page on Area of a Triangle for a video tutorial.

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