Casio FX-82AU PLUS Calculator User Manual


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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
sinr
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
9sin 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 cos1.9p = + - ´ ´ ´
.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.
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