ANSWER:
2100 feet.
STEP:
The perimeter is the length of the outline. Let's say rectangle. The rectangle has length and width. You do (L+W)×2. So in this case, the L is 600. Then, the width is 450. Add 450 and 600. 1050. Now multiply it by 2. 2100. Therefore, the perimeter is 2100 feet.