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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.

1. 2(16 × 6) = 192 square feet

2. 2(16 + 6) = 44 square feet

3. 1 over 2.(16 × 6) = 48 square feet

4. 1 over 2.(6 + 16) = 11 square feet