Chapter 5Test Prep Key Terms 5.1 line line segment (or segment) ray endpoint (of a ray) angle side (of an angle) vertex (of an angle) initial side terminal side positive angle negative angle acute angle right angle obtuse angle straight angle complementary angles (complements) supplementary angles (supplements) standard position (of an angle) quadrantal angle coterminal angles 5.2 sine (sin) cosine (cos) tangent (tan) cotangent (cot) secant (sec) cosecant (csc) degree mode 5.3 side opposite side adjacent cofunctions reference angle 5.4 exact number significant digits angle of elevation angle of depression bearing New Symbols m right angle symbol (for a right triangle) U Greek letter theta ° degree ′ minute ″ second Quick Review Concepts Examples Angles Types of Angles Two positive angles with a sum of 90° are complementary angles. Two positive angles with a sum of 180° are supplementary angles. 1 degree = 60 minutes 11° =60′2 1 minute = 60 seconds 11′ =60″2 Coterminal angles have measures that differ by a multiple of 360°. Their terminal sides coincide when in standard position. 70° and 90° - 70° = 20° are complementary. 70° and 180° - 70° = 110° are supplementary. 15° 30′ 45″ = 15° + 30 60 ° + 45° 3600 30′ # 1° 60′ = 30 60 ° and 45″ # 1° 3600″ = 45 3600 °. = 15.5125° Decimal degrees The acute angle u in the figure is in standard position. If u measures 46°, find the measure of a positive and a negative coterminal angle. 46° + 360° = 406° 46° - 360° = -314° 5.1 u x y 0 583 CHAPTER 5 Test Prep
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