Casio FX-82AU PLUS Calculator User Manual


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25
Trigonometry
The instructions for working with trigonometry are on pages 10 and 11.
Check your calculator settings!
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
43.6sin 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
tan
q
=
E
2
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 '
12.3cos62 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 1.26
a
=
B
sin 0.634
a
=
C
cos 0.25
a
=
6 Determinethevalueof
0 '
0 '
12sin 36 25
5sin 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.
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.
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