Talk:2021 Fall AMC 12B Problems/Problem 2

To find the area of the figure, it can be divided along the line $x=3$ into two congruent triangles, or the area of the triangle with vertices $(1,0)$ , $(3,2)$ , and $(5,0)$ can be subtracted from the area of the triangle with vertices $(1,0)$ , $(3,5)$ , and $(5,0)$ . Alternatively, Pick's Theorem or the Shoelace Theorem can be used.