Can someone please help me through this problem? I am not even really sure where I should start.
Quadrilateral ABCD has vertices A(-2,-2), B(1,4), C(8,4), D(5,2). Find the area of the quadrilateral, round your answer to the nearest tenth if necessary.
Hint: Partition your polygon so that you get a trapezoid and a triangle, like below.
Then apply your formulas for area of a triangle and area of a trapezoid.