25.7.5 Measurement and Real-World Applications
Core ideaMeasuring a river's width, a mountain's height, or a ship's position — sketch the real problem as a triangle and solve it with the two great laws.
Module goal. We extend trig functions from the right triangle to any triangle, using the two great laws to convert freely between sides and angles, wrapping up this stage and handing the next, Sequences, a foundation of measurable relationships.