Joel wants to fence off a triangular portion of his yard for his chickens. The three pieces of fencing he has measure 8 feet, 15 feet, and 20 feet long. Use this information to answer the following question: Joel cut the longest piece of fencing in order to make a right triangle. Find the perimeter of Joel’s fence.

Please do step by step explanation so I can understand. Plus my teacher won’t give me credit if I don’t show work. I need the answer + step by step explanation ASAP