Which equation can be used to calculate the area of the shaded triangle in the figure below?

a rectangle is shown with a width of 6 ft and a length of 16 ft. there is a diagonal line through the rectangle, and the bottom half is shaded in grey.
choices
2(16 × 6) = 192 square feet
2(16 + 6) = 44 square feet
1 over 2.(16 × 6) = 48 square feet
1 over 2.(6 + 16) = 11 square feet