1. Measuring Angles

CONCEPT PREVIEW Name the corresponding angles and the corresponding sides of each pair of similar triangles. (EA is parallel to CD.)

In Exercises 1–8, use the given vectors to find v⋅w and v⋅v.v = -6i - 5j, w = -10i - 8j

In Exercises 21–28, an object moves in simple harmonic motion described by the given equation, where t is measured in seconds and d in inches. In each exercise, find the following:a. the maximum displacementb. the frequencyc. the time required for one cycle.d = 10 cos 2πt