28
Degrees
Û
Radians
Remember!
The small c in the expression
c
1.4 means radians. When you want to change from
degrees to radians, or the reverse, you must have the calculator set on the measure you
are changing into. The button pressing sequence for degrees
Û
radians and changing
degrees into degrees and minutes is on page 11.
Note!
The only times when the degrees or radians setting is relevant is when you are
converting between degrees and radians or when you are going to press one of the
j
k
or
l
buttons.
1
Express
4
p
radians in degrees.
2
Convert
0
30 into radians, correct to 3 decimal places.
3
Express
5
p
radians in degrees.
4
Convert
0
'
55 30 into radians. Express your answer correct to 3 decimal places.
5
Express
c
1.8 in degrees, correct to the nearest minute.
6
Determine the following values correct to 3 decimal places.
A
c
tan1.6
B
c
cos1.2
C
0
'
sin 54 28
7
Determine the value of
2
1
2
r
q
when
r
= 6.4 and
c
1.9
q
=
.
8
Evaluate
(
)
2
1
2
sin
r
q
q
-
when r = 11.7 and
c
0.8
q
=
. Express your answer correct
to 2 decimal places.
9
Solve the equations for
q
,
2
0
p
q
£
£
. Express each answer correct to 3 decimal
places.
A
sin
0.4
q
=
B
cos
0.128
q
=
C
tan
1.7
q
=
10
Determine the value of
q
, 0
q
p
<
<
for
2
2
2
5
6.2
10
2 5 6.2
cos
q
+
-
´ ´
=
. Express your answer
correct to 3 decimal places.
11
Calculate the value of
a
,
2
0
p
a
<
<
, in the equation
c
9 sin 0.7
sin
10
a
=
. Express
your answer correct to 4 decimal places.
12
Determine the positive solution for
p
in the equation
2
2
2
c
4.8
7.3
2 4.8 7.3 cos1.9
p
=
+
- ´
´
´
. Answer correct to 1 decimal place.
Answers
1
0
45
2
0.524
c
3
36
0
4
0.969
c
5
0
'
103 8
6A
34.233
-
B
0.362
C
0.814
7
38.912
8
5.66
9A
0.412
c
B
1.442
c
C
1.039
c
10
2.20
c
11
0.6185
c
12
9.9
© Sue Thomson and Shriro Australia PTY Limited. This page may be photocopied for classroom use.
