Geometry question Help please?

From the information given, you cannot ume that there is a 90 degree angle in the triangle. If you imagine the two sides of the triangle at 90 degrees to each other, then the triangle will have a height and the sum of all three angles will be 180 degrees. As the height decreases then the 90 degree angle will increase. As the height approaches zero the 90 degree angle will increase and approach 180 degrees and the perimeter will approach 600 feet.