Casio FX-82AU PLUS Manuale Utente
25
Trigonometry
The instructions for working with trigonometry are on pages 10 and 11.
Check your calculator settings!
The statement
The statement
0
sin 30
0.5
=
is correct. Explain why both of the following calculator
screens are displaying the wrong value for
0
sin 30 .
Set your calculator to degrees before you start the following practice questions.
1 Find the value of the following expressions correct to 2 decimal places.
A
0
43.6 sin 52
B
0
28.9 tan 38
C
0
11cos 61
2 Determine the value of
q
correct to the nearest degree.
A cos
0.743
q
=
B tan
1.628
q
=
C sin
0.463
q
=
D
5
4
4
tan
q
=
E
2
5
5
cos
q
=
F
16.3
21.5
sin
q
=
3 Use the x button twice each time to enter the degrees and minutes in the
following expressions. Express each answer correct to 2 decimal places.
A
0
'
8sin 41 28
B
0
'
12.3cos 62 50
C
0
'
7.4 tan 42 13
4 Enter each angle, press p then SHIFT followed by x to express each of the
following angles in degrees and minutes and seconds.
A
0
73.65
B
0
44.78
C
0
25.64
5 Determine the value of
a
correct to the nearest minute. Remember that there are
30 seconds to the minute.
A tan
A tan
1.26
a
=
B sin
0.634
a
=
C cos
0.25
a
=
6 Determine the value of
0
'
0
'
12 sin 36 25
5 sin 28 32
. Express your answer to 2 decimal places.
Answers
The first screen is set in radians and the second in gradients. Change the calculator to
work in degrees by pressing SHIFTw3.
The first screen is set in radians and the second in gradients. Change the calculator to
work in degrees by pressing SHIFTw3.
1A 34.36 B 22.58 C 5.33
2A
0
42 B
0
58
C
0
28
D
0
51 E
0
66
F
0
49
3A 5.30
B 5.62
C 6.71
4A
0
'
''
73 39 0 B
0
'
''
44 46 48
C
0
'
''
25 38 24
5A
0
'
51 34
B
0
'
39 21 C
0
'
75 31
6 2.98
© Sue Thomson and Shriro Australia PTY Limited. This page may be photocopied for classroom use.