The area of a parallelogram is represented by the equation A=bh using this equation the area of the parallelogram, before she cuts out the triangle, is 200in^2. Now we do the same thing for the area of the triangle she cut out of the poster board. The equation A=bh/2 is used to represent the area of a triangle so using this equation we can figure out that the area of the triangle Janelle cuts out is 45in^2. Subtract the area of the triangle from the total area of the poster board to find that the area of poster board she has left is 155in^2.
