# how to get these answers

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#1
how can u get the answer which I highlight in green here?I think they are simple questions but I cannot get the correct answer
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1 year ago
#2
Math hurts my brain
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1 year ago
#3
(Original post by Hedwigeeeee)
how can u get the answer which I highlight in green here?I think they are simple questions but I cannot get the correct answer
For 7, you should be using radians, not degrees.
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#4
(Original post by mqb2766)
For 7, you should be using radians, not degrees.
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1 year ago
#5
(Original post by Hedwigeeeee)
But you have acos(1/3) ~ 60?
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#6
(Original post by mqb2766)
But you have acos(1/3) ~ 60?
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1 year ago
#7
(Original post by Hedwigeeeee)
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#8
(Original post by mqb2766)
u mean transfer 8.398 to radians?
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1 year ago
#9
(Original post by Hedwigeeeee)
u mean transfer 8.398 to radians?
No, youve rooted it. Transform to radians before rooting.
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#10
(Original post by mqb2766)
No, youve rooted it. Transform to radians before rooting.
but that one gives no answer...
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1 year ago
#11
(Original post by Hedwigeeeee)
but that one gives no answer...
Your calculator is still set to degrees.
SHIFT
SETUP
2
2
1
#12
(Original post by BuryMathsTutor)
Your calculator is still set to degrees.
SHIFT
SETUP
2
2
so how can I do it with degrees？with degrees, I did (arccos(1/3))^0.5, and I convert the final answer to radians, but I got 0.147
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1 year ago
#13
(Original post by Hedwigeeeee)
so how can I do it with degrees？with degrees, I did (arccos(1/3))^0.5, and I convert the final answer to radians, but I got 0.147
There's no reason to be doing this in degrees.
Enter
1 =
and then continue as in the image below, repeatedly pressing =.
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#14
(Original post by BuryMathsTutor)
There's no reason to be doing this in degrees.
Enter
1 =
and then continue as in the image below, repeatedly pressing =.
I have never tried that button to convert degree to radians! so why here we should use radians here?I cannot just use the degree form and convert sth by divide or multiply 180/pi? when I should convert degree to radians form?
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1 year ago
#15
(Original post by Hedwigeeeee)
I have never tried that button to convert degree to radians! so why here we should use radians here?I cannot just use the degree form and convert sth by divide or multiply 180/pi? when I should convert degree to radians form?
If a question is in radians, use radians on the calculator. I’m shocked your teacher never told you this.
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#16
(Original post by Jamie_1712)
If a question is in radians, use radians on the calculator. I’m shocked your teacher never told you this.
we normally use 180/pi to convert, but I found it wrong here. so I can't use any degree forms here right? and there is no way to convert?
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1 year ago
#17
(Original post by Hedwigeeeee)
we normally use 180/pi to convert, but I found it wrong here. so I can't use any degree forms here right? and there is no way to convert?
You could do that after the acos, but before the root, as mentioned above.
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#18
(Original post by mqb2766)
You could do that after the acos, but before the root, as mentioned above.
ahhhhh，I think I shold convert before squaring root! thank u
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1 year ago
#19
(Original post by Hedwigeeeee)
ahhhhh，I think I shold convert before squaring root! thank u
0
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