Trigonometry - Casio FX-82AU PLUS Using Manual

The instructions for working with trigonometry are on pages 10 and 11.
Check your calculator settings!
The statement sin 30
screens are displaying the wrong value for
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 43.6 sin 52
2 Determine the value of
q
A cos = 0.743
q 5
D tan =
4
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.
0
A 8sin 41 28
4 Enter each angle, press p then SHIFT followed by x to express each of the
following angles in degrees and minutes and seconds.
0
A 73.65
5 Determine the value of
30 seconds to the minute.
A tan a = 1.26
6 Determine the value of
Answers
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
3A 5.30 B 5.62 C 6.71
0 '
5A 51 34 B 39 21 C
© Sue Thomson and Shriro Australia PTY Limited. This page may be photocopied for classroom use.

Trigonometry

0
= 0.5 is correct. Explain why both of the following calculator
0
B 28.9 tan 38
q correct to the nearest degree.
q
B tan = 1.628
q
E cos =
5
'
B 12.3cos 62 50
0
B 44.78
a
correct to the nearest minute. Remember that there are
B sin a = 0.634
0
12 sin 36 25
0
5 sin 28 32
2A
4A
0 ' 0 '
75 31
0
sin 30 .
0
C 11cos 61
q
C sin =
2
F sin q =
0 '
C 7.4 tan 42 13
C 25.64
C cos a
'
. Express your answer to 2 decimal places.
'
0 0 0
42 B 58 C 28 D
0 ' '' 0
73 39 0 B 44 46 48
6 2.98
0
0.463
16.3
21.5
0 '
0
= 0.25
0 0
51 E 66 F
' '' 0 ' ''
C 25 38 24
0
49
25