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# How can you find the circumference of a circle using the FX-ES 115 Plus?

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Th formula is PI *dia.

Pi is available on this model using Shift key + X10 key at middle bottom.

So enter Pi then key x (multiply) then enter diameter then = key.

http://support.casio.com/storage/en/manual/pdf/EN/004/fx-115_991ES_PLUS_C_EN.pdf

Posted on Nov 10, 2014

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Posted on Jan 02, 2017

Hello
First you must set Matrix calculation
[MODE][6:Matrix]. Then By entering one of the numbers [1:MatA] or [2:Matb] or [3:MatC] you get to choose the dimensions of the matrix
(mxn]. Once finished entering the matrix you clear the screen.
The operations on matrices are available by pressing [Shift][Matrix]
[1:Dim] to change the dimension of a matrix (in fact redefining the matrix)
[2:Data] enter values in a matrix
[3:MatA] access Matrix A
[4:Matb] access Matrix B
[5:MatC] access matrix C
[6:MatAns] access the Answer Matrix (the last matrix calculated)
[7:det] Calculate the determinant of a matrix already defined
[8:Trn] The transpose of a matrix already defined

To add matrices MatA+MatB
To subtract MatA-MatB
To multiply MatAxMatB
To raise a matrixe to a power 2 [x2], cube [x3]
To obtain inverse of MatA already defined MatA[x-1] [x-1] is the x to the power -1 key
Dimensions of matrices involved in operations must match (see you textbook for the rules)

Read the appendix to your user manual, there are several exemples.
Hope helps

Posted on Oct 12, 2009

SOURCE: how do I use the memory

Hello,
You have 7 memory registers, namely A, B,C, D, X, and Y.
To store a value in say register A you press [SHIFT][RCL] (STO) A. The (STO) is the function you acces when you press [SHIFT][RCL].

Thus
23 [SHIFT][RCL] A displays 23 -->A and the value is shown on the bottom of the screen.

To recall a value from register A, you press [RCL] A.
Hope it helps.

Posted on Nov 04, 2009

Go to link below and download the manual it is all in that. support.casio.com/pdf/004/fx-5800P_E.pdf

Posted on Mar 07, 2010

Press SHIFT MODE to access (SETUP)
Press 3:deg for degree OR

Posted on Apr 05, 2010

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## Related Questions:

### When i press MODE there is no choice 6 [Matrix] and i want to multiple matrices there are only 3 choices 1: COMP, 2:STAT, 3: TABLE.

You are confusing this calculator with one of its more sophisticated brothers (FX 115 ES Plus or FX991ES plus). The 82 ES plus has only three modes.

Jun 02, 2015 | Casio FX82ES Scientific Calculator

### How do i get answers as decimals in casio fx 115 es plus

To convert a single result to decimal, press the S<=>D button just above the DEL button. To have all results come out in decimal, press SHIFT MODE 2 to switch to the LineIO mode.

Jun 05, 2014 | Casio FX-115ES Scientific Calculator

### Is it possible to solve eqn in this 82ms calculator

Sorry, It is not possible to solve equations on the Casio FX-82 ms. Try the Casio FX-115 ES/ FX-115 ES Plus, FX-991ES/ FX-881 ES Plus C.

Oct 29, 2013 | Casio FX82MS Scientific Calculator

### How can i write this in my calculator example. 2x=10 the answer is x=5 but how can i put x in the calculator

What you want to do is solve the linear equation 2x=10 to find the value of the unknown x that makes the equality true. Solving an equation usually involves rearranging therms, factors and so on. However your calculator was not designed to handle the solution of equations, no matter how simple they are.
Some Casio scientific calculators can solve some types of equations (polynomials of degree 2 or 3, simultaneous linear equations in up to 3 unknowns). These are the FX-115 ES (Plus) and FX-991 ES (Plus C). Other equivalent models are sold in the world under different names.

Oct 16, 2013 | Casio FX350MS Scientific Calculator

### Which model of casio csn do integration in limits

The Casios FX-115 ES , FX-115 ES PLus, FX-991 ES, FX-991 ES Plus C can perfom numerical differentiation at a point, and numerical integration between two given limits.

Aug 12, 2013 | Casio FX991ES Scientific Calculator

### My fx-115 es wont allow any decimals, and the word 'dec' appears on the screen at all times

Try reseting it by pressing "shift" , "9" , and "3" in that order after you turn it on. It might fix it mine did the same thing and it fixed it.

Apr 23, 2012 | Casio FX-115 Solar 236 Function Scientific...

### When I type sin(60) into my fx-115 ES calculator I get the answer 0.8090169944 how do I change it so that it will give me a number that could be found on the unit circle?

Your calculator's angle unit is set to grads. In that unit, the value of cosine 60 is correct. You might want to change the unit to degree to get a more orthodox result.
Press SHIFT MODE to access (Setup) and select degree or radians as angle units.
As to a `number that could be found on the unit circle``, I admit I do not understand what you mean because the sine is the measure of a segment that lies along the y-axis and not on the unit circle. If you care to clarify what you want, I may be able to help.

Jun 04, 2011 | Casio FX-115ES Scientific Calculator

### Casio FX-115 ES: SIN,COS,TAN (answer isnt correct)

Hello,
It may be due to the angle unit used. You can have angles in degrees, in radians, and in grads. You should set the default angle unit to waht you problem calls for.
To set degree as default SHIFT MODE 3
To set radians as default SHIFT MODE 4
To set grads as default SHIFT MODE 5

The values of angles calculated by the inverse trigonometric functions are in the default unit that is set . This may be the source of the wrong answers that you get.

Hope it helps.

Sep 16, 2009 | Casio FX-115ES Scientific Calculator

### Math book for the fx-115-es

Hello,

Use your internet seach engine or go to the casio worldwide web site. A google search returned this link to the New-Zealand site.

http://casionz.co.nz/Site/Pronto/Files/user_manuals/FX-115ES%20991ES.PDF

Hope it helps

Mar 09, 2009 | Casio FX-115ES Scientific Calculator

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