# How do I get a numerical answer when I type 4 times pi? I simply get 4pi.

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Try 4 x 3.14 (PI=3.14)

Posted on Jan 04, 2011

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Posted on Jan 02, 2017

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## Related Questions:

### How do you change the units on the x-axis to terms of pi?

The xmin and xmax values are the left and right endpoints (respectively) for the x-axis. In window settings type - pi and + pi for your request. At fist type diamond button and then F2 to get window menu

Mar 22, 2014 | Texas Instruments TI-89 Calculator

### I can not graph a parametric equation useing radians. I am using a TI-nsipre with out any updates since purchase not a CAS or CX one.

In parametric functions, the variables x and y are both functions of an independent variable, called t, and that usually represents the time. The default variable in parametric functions must be called t. You can enter the limits you want. However if you type in 2 Pi it will be converted on the entry line to 6.28. The default tstep is 0.13 which is about pi/24. I fail to see what the commotion is about.
In this representation of the witch of Agnesi, the variable t is between 0 and 4Pi, and the step tstep is 0.13, a little less that pi/24

Mar 14, 2014 | Texas Instruments TI-Nspire Graphing...

### The radius of a circular pond is 14 m.Find the radius of another circular pond whose area is one-fourth of the area of this circular pond.Answer of this question.

The area of a circle is pi * r^^2.
For the first pond, the area is pi *14^^2. Let's say that is A
For the second pond the area is pi * r^^2. Let's say that is a.
But a = A/4 or, conversely 4a = A.
But A = pi*14^^2 = 4a = 4(pi * r^^2) or
pi*14^^2 = 4(pi*r^^2) or
pi*14^^2 = 4pi*r^^2 or
14^^2 = 4*r^^2
196 = 4*r^^2
196/4 = r^^2
49=r^^2
7=r
So a pond of radius 7m has an area a quarter of a circular pond of 14m.

Jan 26, 2014 | Mathsoft Computers & Internet

### 1 - cos2x - sinx = 0

There are an infinite number of solutions for this. Among them are 0, pi, 2pi, 3pi, and 4pi (see a pattern?).

Jun 12, 2013 | Computers & Internet

### Find the trig function given its period cos 5 pi

cos(5PI)=cos(4PI+PI)=cos(PI)=-1
sin(19PI/6)=sin(18PI/6+ PI/6)=sin(3PI +Pi/6)=sin(2PI+PI+PI/6)=sin(PI+PI/6)=sin(-PI/6)=-sin(PI/6)=-1/2

Dec 12, 2011 | Super Tutor Trigonometry (ESDTRIG) for PC

### Trying to find the surface area of a sphere given the volume: V = 4/3 X pi X r cube problem given vol. find the surface area v = 5000 5000(3/4 pi =r cube the book reads: 3 cube before and the square...

Almost exactly the way it's written in the book.

In the LineIO mode press
3 SHIFT [xth-root] 5 0 0 0 * 3 / ( 4 * SHIFT [pi] ) ) =

In the MathIO mode press
SHIFT [xth-root] 3 right-arrow 5 0 0 0 * 3 / ( 4 * SHIFT [pi]) =

xth-root is the shifted function of the key just below and right of the big round cursor pad.
* is the multiply key
/ is the divide key
pi is the shifted function of the x10^x key in the middle of the bottom row

BTW there's no "square root" in this problem. There's a "cube root" or "third root". Square root is the second root.

May 14, 2011 | Casio fx-300ES Calculator

### How do I enter 2 x pi on my casio fx85 calculator to get a numerical value as the answer rather than 2pi?

Press the S-D key to convert between symbolic and numeric forms. To have all answers come out numerically, press SHIFT MODE 2 to switch to the LineIO mode.

Feb 10, 2011 | Casio FX-115ES Scientific Calculator

### When I type sin(6pi) in my calculator I get: 2x10^ -13 But sin(6pi) is normally 0. The calculator gives the right answer when in degrees: sin(3x360) = 0 How to fix this ?

The sine of 6pi is indeed zero. The calculator works with twelve decimal digits while pi is an irrational number with an infinite number of decimal digits. Thus the calculator cannot actually calculate the sine of 6pi, instead it calculates the sine of 18.8495559215. The sine of that number is close to zero but not quite, about 0.000000000002 which is what the calculator shows. This is a natural consequence of using finite machines to deal with infinite numbers.

In degrees, 3*360 is 1080 exactly and thus the calculator can produce an answer of exactly zero.

You'll notice that the calculator also gives a nonzero result for the sine of 4pi.

The "proper" fix for this is something called "argument reduction." If the argument lies outside the range of 0 to 2pi (or alternatively, the range -pi to pi), add or subtract multiples of 2pi until the argument is inside the range. So in this case, subtract 6pi from 6pi to get zero, then take the sine of that.

Bear in mind that argument reduction won't always work, since it too is limited to twelve-digit arithmetic.

Dec 12, 2010 | Texas Instruments TI-84 Plus Calculator

### Radian mode does not work properly

-1E-13 is a very small number. When doing this kind of a problem you can regard 1E-13 as 0.

Remember that pi is an irrational number. It is only estimated on your calculator. I just played around with a TI-83 and found the following answers:

cos(pi/2) = 0
cos(2*pi + pi/2) = 0
cos(4*pi + pi/2) = 1E-13
cos(20*pi + pi/2) = -1E-13

As you know, that correct answer to each of these is 0. The calculator gives non-zero answers because some very small errors are accumulating. There is nothing wrong with your calculator.

Nov 20, 2007 | Texas Instruments TI-83 Plus Calculator

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