copyright © 2011 pearson education, inc. radian measure, arc length, and area section 1.2 angles...
TRANSCRIPT
Copyright © 2011 Pearson Education, Inc.
Radian Measure, Arc Length, and Area
Section 1.2
Angles and the Trigonometric Functions
Copyright © 2011 Pearson Education, Inc. Slide 1-3
1.2
Figure 1.9
Radian Measure of Angles
Copyright © 2011 Pearson Education, Inc. Slide 1-4
1.2
The radian measure of the angle in standard position is the directed length of the intercepted arc on the unit circle.
Radian Measure of Angles
Copyright © 2011 Pearson Education, Inc. Slide 1-5
1.2
Conversion from degrees to radians or radians to degrees is based on
180 degrees = π radians.
Degree-Radian Conversion
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1.2
Figure 1.12
Radian Measure of Angles
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1.2
Figure 1.15
Radian Measure of Angles
Copyright © 2011 Pearson Education, Inc. Slide 1-8
1.2
Figure 1.17
The length s of an arc intercepted by a central angle of radians on a circle of radius r is given by
s = r.
Arc Length of a Circle
Copyright © 2011 Pearson Education, Inc. Slide 1-9
1.2
Figure 1.21
The area A of a sector with central angle (in radians) in a circle of radius r is given by
.2
2rA
Area of a Sector of a Circle