To determine the total length of the race course around the triangle-shaped grassy area, we need to know the lengths of the sides of the triangle. However, since the information about the dimensions of the triangle is not provided in your question, I can't calculate the total length directly.
To find the total length of the race course (the perimeter of the triangle), you would typically add the lengths of all three sides:
Total Length = Side A + Side B + Side C.
If you have the specific side lengths, substitute them into the equation. Based on the answer choices provided (17.31 km, 4.754 km, 1.731 km, and 5.754 km), it would appear that the total could be one of those values once the sides are added.
If you can provide the lengths of the sides or any additional information about the triangle, I'd be happy to help with the calculation!