pc03.4 radian measure of angles
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Section 3-4Radian Measures of
Angles
Definition:
Radian Measure of an Angle
r = 1r = x
1 unit
x units
1 radian
A 1 radian angle subtends the same fraction of a circle regardless of the length of the radius.
Procedure:
Radian-Degree ConversionTo find the radian measure of q, multiply the degree measure by
To find the degree measure of q, multiply the radian measure by
Radian Measures of Some Special Angles
http://www.lsquaredmath.us/radians/index.php
http://www.lsquaredmath.us/radians/targetPractice.php
Angle Target Practice
Radian Measure and the Unit Circle
1
A
B
C
D
E
F
G
Convert 2250 to radians
H
2 Convert 4.73 radians to degrees
3 Find the radian measure of an angle whose sine is 0.4
4 Find the degree measure of an angle whose sine is 0.4
5 Find the exact value of
A
B
C
D
E
F
G
H Undefined
Radian Mode: Degree Mode:
Your calculator:
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