To find the area of parallelogram RSTU, Juan starts by drawing a rectangle around it. Each vertex of parallelogram RSTU is on a side of the rectangle he draws. Which expression can be subtracted from the area of the rectangle to find the area of parallelogram RSTU?
A.2 (18 + 4)
B.1/2(18 + 4)
C.(18 + 4)
D.(18 - 4)
Its C.(18+4) just got it right on idgenuity someone can answer for free pts.