253
Chapter 8
Exercises 8.1
1.
30
° =
30
⋅
π
180
radians
=
π
6
radians
120
° =
120
⋅
π
180
radians
=
2
π
3
radians
315
° =
315
⋅
π
180
radians
=
7
π
4
radians
2.
18
° =
18
⋅
π
180
radians
=
π
10
radians
72
° =
72
⋅
π
180
radians
=
2
π
5
radians
150
° =
150
⋅
π
180
radians
=
5
π
6
radians
3.
450
° =
450
⋅
π
180
radians
=
5
π
2
radians
−
210
° = −
210
⋅
π
180
radians
= −
7
π
6
radians
−
90
° = −
90
⋅
π
180
radians
= −
π
2
radians
4.
990
° =
990
⋅
π
180
radians
=
11
π
2
radians
−
270
° = −
270
⋅
π
180
radians
= −
3
π
2
radians
−
540
° = −
540
⋅
π
180
radians
= −
3
π
radians
5.
t
=
8
⋅
π
2
=
4
π
radians
6.
t
= −
3
⋅
π
2
= −
3
π
2
radians
7.
t
=
7
⋅
π
2
=
7
π
2
radians
8.
t
=
9
⋅
π
2
=
9
π
2
radians
9.
t
= −
6
⋅
π
2
= −
3
π
radians
10.
t
= −
5
⋅
π
2
= −
5
π
2
radians
11.
t
=
2
⋅
π
3
=
2
π
3
radians
12.
t
=
5
⋅
π
4
=
5
π
4
radians
13.
3
π
2
3
π
4
5
π
14.
x
y
π
3
x
y
5
π
2
x
y
6
π

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