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AGENDA:
DG 16 --- 10 minutes
Notes Lesson 2 Unit 5
DG 17 Mon
ACCEL PRECALC UNIT #5:INTRODUCTION TO TRIGONOMETRY LESSON #2: CONVERTING ANGLE MEASURES
EQ: How do you convert angle measures in radians to angle measure in degrees?
Converting angle measures:
deg
180
radians
Ex. Convert each angle measure. Reduce all fractions.
In Class Practice: Worksheet “ Angle Measure”
Calculator Conversions
Degrees, Minutes, Seconds
Ex. Convert degrees, minutes, seconds to decimal degrees and vice-versa.
50.106˚ 21˚15’22”
Arc length--- portion of a circle enclosed by 2 radii
s = rθ where θ is the radian measure of the central angle.
Ex. Find the arc length given a radius of 8 and a central angle of
4
3 .
6
84
3
s
s *** angle already in radian measure
Ex. A circle has a radius of 4 inches. Find the length of the major arc and the minor arc.
Major Arc :
Minor Arc :
3
4180
240
3
2180
120
ASSIGNMENT: textbook p. 292 – 293 #43 – 93 odd
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