A right triangle is removed from a rectangle as shown in the figure below.
A right triangle of height 9 m-m is removed from the rectangle of length 18 m-m and width 15 m-m. The length to the left of the removed triangle is 3 m-m and to the right is 9 m-m.
What is the area of the remaining part of the rectangle?
A.
B.
C.
D.