Trigonometry is a field of mathematics that studies the relationships that exist between the sides of a triangle and its angles. How much do you know about the properties of triangles? Have you worked with them much in the past?

These relationships and properties can be used to model many physical properties in the real world. One of these properties is called periodic motion, such as the motion made by a yo-yo going up and down. What kinds of periodic motion are you familiar with? Why might scientists and businesses be interested in tracking this type of motion using equations?