Name: __________________________________________ Date: __________________
3.1 - 3.2
Coterminal and Reference Angles of Radian Measures
To find a coterminal angle in radian measure: add or subtract 2π .
Find a coterminal angle between 0 and 2π .
7π
3
11π
4
−17π
6
−7π
2
To find a reference angle:
1. Find a coterminal angle if needed.
2. Determine which quadrant the angle is in.
3. Use either π or 2π to subtract.
Find the reference angle for each of the following.
3π
7
−5π
4
13π
8
−12π
5
Name: __________________________________________ Date: __________________
3.1 - 3.2
Coterminal and Reference Angles of Radian Measures
To find a coterminal angle in radian measure: add or subtract 2π .
Find a coterminal angle between 0 and 2π .
7π
3
11π
4
−17π
6
−7π
2
To find a reference angle:
1. Find a coterminal angle if needed.
2. Determine which quadrant the angle is in.
3. Use either π or 2π to subtract.
Find the reference angle for each of the following.
3π
7
−5π
4
13π
8
−12π
5
Name: __________________________________________ Date: __________________
3.1 - 3.2
Find the coterminal and reference angle for each angle.
1.
13π
4
2. −
4.
−9π
2
5.
15π
7
10π
3
3.
19π
6
6. −
12π
5
Name: __________________________________________ Date: __________________
3.1 - 3.2
Find the coterminal and reference angle for each angle.
1.
13π
4
2. −
4.
−9π
2
5.
15π
7
10π
3
3.
19π
6
6. −
12π
5