Answer:
Step-by-step explanation:
The grassy area is that of a trapezoid, so recall the formula for the area of a trapezoid:
where:
<em>Base</em> stands for the larger base (in our case the dimension "B" in the attached image)
<em>base </em>stands for the shorter base parallel to the largest Base (in our case the dimension "<em>b</em>" in the attached image)
and
<em>height</em> stands for the distance between bases (in our case the dimension "<em>h</em>" in the attached image.
Therefore the formula for the area of the grassy section becomes: