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Area of Triangle on coordinate plane

How do you find the area of a triangle when you don't have a right angle or an altitude?. You can use the coordinates in order to find the area of the triangle

Video Guide

:20 Sample problem one Find the area of a triangle that is drawn on a coordinate plane

The triangle does not have a right angle or an altitude drawn

:39 Step one Identify the vertices and write down the coordinates

1:09 Use the formula Area = Ax(By-Cy) + Bx(Cy-Ay)+(Ay-By)/2

in order find the area of the triangle

2:00 Plug the coordinates into the area formula

3:17 Simplify the formula after plugging in numbers

4:16 Answer to the sample problem involving finding the area of a triangle on a coordinate plane

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