# how to get answers in terms of pi on a calculator

Watch
Announcements
#1
im doing radians and my calculator is still in the radians mode but all the answers are coming up as decimals and I cant change them to pi. anyone have any ideas what I could do? I have a casio fx-83gt plus if that helps.

thanks !!
0
2 years ago
#2
Change it to degrees
0
#3
(Original post by Cov3rt)
Change it to degrees
0
2 years ago
#4
(Original post by emiuk)

Some fairly simple rational coefficients of can be obtained and shown; i.e.

but others might be too much for a calculator; i.e. . But this is not that much of a problem. Just ignore pi and do "11/59 + 28/13" first and that will give you the fraction. Then include pi alongside it, job done.

Also when doing something like inverse cosine of a number, you're not always going to get a multiple of pi for your calculator to show, so don't expect it every time.
Last edited by RDKGames; 2 years ago
1
#5
I'm getting the radians because it's in the radians mode. Thanks for this, but I was more specifically looking to see if there was another mode I could change it to since this one for some reason suddenly stopped working (for example tan-1(45) will come up as 1.54857.... instead of pi/2 as it used to)
(Original post by RDKGames)

Some fairly simple rational coefficients of can be obtained and shown; i.e.

but others might be too much for a calculator; i.e. . But this is not that much of a problem. Just ignore pi and do "11/59 + 28/13" first and that will give you the fraction. Then include pi alongside it, job done.

Also when doing something like inverse cosine of a number, you're not always going to get a multiple of pi for your calculator to show, so don't expect it every time.
0
2 years ago
#6
just divide the answer by pi. if you get 0.3 then the answer was 0.3pi
3
2 years ago
#7
(Original post by emiuk)
I'm getting the radians because it's in the radians mode. Thanks for this, but I was more specifically looking to see if there was another mode I could change it to since this one for some reason suddenly stopped working (for example tan-1(45) will come up as 1.54857.... instead of pi/2 as it used to)
But is not . Why would it come up as that?
0
#8
(Original post by RDKGames)
But is not . Why would it come up as that?
0
2 years ago
#9
(Original post by emiuk)
But it's not...

The answer is something 'close' to pi/2, but it's not exactly pi/2
0
#10
thanks !!
(Original post by the bear)
just divide the answer by pi. if you get 0.3 then the answer was 0.3pi
0
#11
ok but for the questions on my exam when it asks to find an angle giving the the answer in pi i need the pi form
(Original post by RDKGames)
But it's not...

The answer is something 'close' to pi/2, but it's not exactly pi/2
0
2 years ago
#12
(Original post by emiuk)
I'm getting the radians because it's in the radians mode. Thanks for this, but I was more specifically looking to see if there was another mode I could change it to since this one for some reason suddenly stopped working (for example tan-1(45) will come up as 1.54857.... instead of pi/2 as it used to)

*shift, 9, 3, =, AC*

and then change back to the radians mode via your setup, if there is any problem, this should hopefully fix it if it is displaying unexpected results.
0
2 years ago
#13
(Original post by emiuk)
ok but for the questions on my exam when it asks to find an angle giving the the answer in pi i need the pi form
Then those angles will be simple ones, definitely not something where you need to know or write arctan(45).
0
#14
yeah I tried it but it didn't work
(Original post by Strelzo)

*shift, 9, 3, =, AC*

and then change back to the radians mode via your setup, if there is any problem, this should hopefully fix it if it is displaying unexpected results.
0
2 years ago
#15
(Original post by emiuk)
yeah I tried it but it didn't work
Hmm, perhaps look online to see if there's another solution to your problem?I thought for sure that'd work, as it works for me whenever I have a calculator problem.
0
2 years ago
#16
(Original post by RDKGames)
Then those angles will be simple ones, definitely not something where you need to know or write arctan(45).
i expect that the original problem involved arctan(1)
0
#17
but I do need it.... for example a question is:
solve the equation of cot^2 x + cosec^2 x=7 giving all the solutions in the interval 0 ≤ x ≤ 2pi in terms of pi

and that comes to √1/3 =tanx I have worked out so far...

(Original post by RDKGames)
Then those angles will be simple ones, definitely not something where you need to know or write arctan(45).
0
#18
ive been looking for the past half an hour but found nothing useful :/
this happened to me with a different calculator a few days ago as well and after an hour or so it went back to showing pi. it's really reassuring to go into an exam knowing my calculator could f me over
(Original post by Strelzo)
Hmm, perhaps look online to see if there's another solution to your problem?I thought for sure that'd work, as it works for me whenever I have a calculator problem.
0
2 years ago
#19
a) It does not reduce to entirely.

b) Still not sure where you are pulling arctan(45) from, unless I'm misinterpreting what you're trying to say.
1
#20
1) I used decimals to see if I was going in the right direction using 1/√3= tan x and I got all the angles right (I checked by converting the answer into decimals). I did this to check that I was doing the right method, but I still cant get the answers in pi form

2) it was just an example because it's what I used for one of the last ones where my calculator showed the answer in pi

(Original post by RDKGames)
a) It does not reduce to entirely.

b) Still not sure where you are pulling arctan(45) from, unless I'm misinterpreting what you're trying to say.
1
X

new posts
Back
to top
Latest
My Feed

### Oops, nobody has postedin the last few hours.

Why not re-start the conversation?

see more

### See more of what you like onThe Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

### Poll

Join the discussion

Yes (358)
84.04%
No (68)
15.96%