For 16, sketch the angle in standard position in a uv-coordinate system, and then mark and find the measure of the reference angle. Find the sine or cosine of the angle and its reference angle. Explain the relationship between them.

Compara▯veAnatomyLab Prac▯cal2 Origin:middorsalline fromneuralprocesses ofmostthoracic vertebrae Origin:clavicle andraphe Inser▯on:medial surfaceofulna, justdistalto semilunarnotch Ac▯on:ﬂexes forearm Origin:mastoidprocess Inser▯on:sternum Ac▯on:rota▯onofhead Spinodeltoid Origin:middlethirdof spineofscapula Inser▯on:humerus Origin:posteriormargin ofacromionofscapula Inser▯on:lateralsurface ofspinodeltoidmuscle Ac▯on:ﬂexesandrotates humeruslaterally Ac▯on:drawsscapula anteriorly Ac▯on:(allthree)extend forearm Origin:manubrium (sternum) Inser▯on:fasciacovering proximalsurfaceof forearm(antebrachium) Ac▯on:adducts humerus;bringsarmsin medially Origin:anterior sternebra