John's mother told him that she would like a garden in the shape of a triangle, which can be represented by Triangle ABC. His mother has also given him some measurement guidelines of the garden, which can be found below: Line segment AB has a length of 5.596 feet.
Line segment BC has a length of 8.416 feet.
Line segment AC has a length of 10.11 feet.
Angle BAC measures 56.38°.
Angle ACB measures 33.62°.

Using your knowledge of interior angles of triangles, explain the equation John can use to calculate the area of the triangle, rounded to the nearest thousandth. Include the measurement of Angle ABC