What do you need to know about a right triangle in order to use right triangle trigonometry?

Factor this polynomial completely x^2-64

Cody ran nine miles on his first day of training. the next day he ran 1/8 that distance. how far did he run the second day?

Thomas is using a drawing program to complete a construction. which construction could he be completing? two perpendicular lines are drawn. inscribing an equilateral triangle in a circle inscribing a square in a circle inscribing a regular pentagon in a circle inscribing a regular hexagon in a circle