Each outer wall of the Pentagon in Washington D. C , measures 921 feet .What is the measure of each angle made by the Pentagon’s outer walls?

Can someone me and do the problem plz so i can understand it more better

The midpoints of the sides of the large square are joined to form a smaller square. what is the area of the smaller square

Adolphin is swimming with her friend. the dolphin jumps to a height of 4.54.54, point, 5 meters above the surface of the water as her friend swims 9.89.89, point, 8 meters directly below her. what is the position of the dolphin's friend relative to the surface of the water? meters