Refer to the Figure:Side BC equals 40m. Side AD equals 20m. The triangle formed by the points AaD represents an area of right-of-way for a borrow pit. What is the area of the shaded triangle? (Round to nearest whole meter)

Refer to the Figure:Side BC equals 40m. Side AD equals 20m. The triangle formed by the points AaD represents an area of right-of-way for a borrow pit. What is the area of the shaded triangle? (Round to nearest whole meter)