I think the answer is D. But I am not sure if that's the right answer.
Answer:
B
Step-by-step explanation:
The sum of the interior angles of a polygon is
sum = (n - 2) × 180° ← n is the number of sides
The answer is the last option: 
Explanation:
1. You have that the equation of the line is:

Where
is the slope of the line and
is the intercept with the y-axis.
2. Therefore, you must find
.
3. Then, you must substitute the points given in the problem and the slope into the equation of the line and solve for
, as following:

Answer:
2(l+b)
2(600cm+700cm)
2(1300cm)
2600cm
Therefore, the perimeter of the rectangular court is 2600cm.