Sasha is building a tree house. The walls are 6.5 feet​ tall, and she is using a brace to hold up the wall while she nails it to the floor. The brace is 8 feet long. One end of the brace is positioned at the top of the​ wall, and one end is positioned 5 feet from the base of the wall. Does her wall meet the floor at a right​ angle? Explain.