A square is shown below. Which expression can be used to find the area, in square units, of the shaded triangle in the square?
 A square with a side length of 8 units is shown. A diagonal is drawn with one section shaded inside the figure.
 fraction 1 over 2 ⋅ 4 ⋅ 4
 fraction 1 over 4 ⋅ 4 ⋅ 4
 fraction 1 over 2 ⋅ 8 ⋅ 8
 fraction 1 over 4 ⋅ 8 ⋅ 8