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# What is pi - Mathsoft Computers & Internet

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Pi is the ratio of the circumference to the diameter of any circle, that is, C = Pi * D. It is an irrational number, which means it cannot be calculated by the ratio of any 2 integers (although 22/7 is often used as an approximate value), and as a decimal it goes on forever without repeating (it is 3.14159 to 5 decimals only).

Posted on Feb 07, 2015

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22:7

Posted on Feb 06, 2015

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Posted on Jan 02, 2017

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## Related Questions:

### What is pi eqaul to

The circumference (perimeter) of a circle is given by the formula
C = 2 (pi) (r), where r is the radius. Since radius is half of the diameter, d = 2 (r), so C = (pi) d.
Dividing both sides by d to get pi by itself, pi is the circumference of a circle divided by the diameter.

Pi is irrational, meaning that it goes on forever, without repeating numbers and cannot be represented as a fraction.

In everyday life, we often use 22/7 as an approximation of pi. Other people use 3.14.

I have memorized what my calculator gave me plus one more decimal, 3.1415926536.

Others have memorized it to thousands of digits and people have spent their lifetimes calculating pi to more and more decimals. Books have been written about pi.

Some schools celebrate Pi Day, since Pi begins with 3.14, it is celebrated on March 14th.

Good luck,

Paul

https://en.wikipedia.org/wiki/Pi

Jan 04, 2017 | Office Equipment & Supplies

### Words with these letters

Pianist
Ani Spit
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Ani Tips
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Spain Ti
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Paints I
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At Sin Pi

Oct 19, 2016 | Miscellaneous

### Unable to use pi (instead of 3.14) when using formulas which require pi

If you want to square an expression enclose it in parentheses and raise to the second power.

Jul 27, 2015 | Casio Scientific Calculator Fx-82es Plus

### Area of circle

(pi)R squared (Fixya won't let me use the sign for Pi)

example: suppose the radius of a circle is 10 inches, then the Area of the circle would be pi times 10 times 10 or 100*pi

pi represents the circumference (distance around) of a circle / diameter and for any circle is constantly the same number which is approximately 3.14

so in my example 100*pi=100*3.14 or 314 square inches

Jul 03, 2014 | Computers & Internet

### Formula for circumference

Circumference of a Circle: 2 x pi x radius - OR - pi x diameter,

or if you need some sphere calculations?

Sphere Surface Area: 4 X pi X radius squared OR
pi X diameter squared Sphere Volume: 4/3 X pi X radius cubed OR
( pi X diameter cubed ) / 6
By the way.......... "pi" = 3.1415926536

Apr 29, 2014 | Office Equipment & Supplies

### 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

### 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

### Convert -525 degrees into radain pi form

Here is some help
180deg is equivalent to Pi radians
Take some angle. Its measure in degrees is say x_deg, Its measure expressed in radians is x_rad.
The fraction of 180 deg that the angle represents is equal to the fraction of PI that this angle represents.
Conclusion: the ratio x_deg/ 180 deg must be equal to the ratio of x_rad/PI

Isolate X-rad in the above equation. Some will tell you to cross multiply.

Keep the value (525/180) as a fraction reduced to its simplest form. The result is 35/12

Sep 26, 2011 | Casio FX-115ES Scientific Calculator

### Math problem

This sounds like someones homework. I'm risking my reputation here but here goes.

Previous Area was Pi x R x R. = Pi X 10 X 10 = 100 X Pi
Previous Perimeter is 2 X Pi X R = 2 X Pi X 10 = 20 X Pi

New shape is a rectangle with a semicircle at each end and width of 10 cm.
New Perimeter is circular bits + straight edges between them.
We know the circular bits but not how long the straight bits are so ...
Perimeter = 20 X Pi = (2 X Pi X 5) + L X 2 = 10 X Pi + (L X 2)
So L = (20 - 10) X Pi / 2 = 5 X Pi.

So the new Area is ... (Pi X 5 X 5) + (10 X 5 X Pi)
= 75 X Pi.
= 75 X 3.14 = 235.5

Nov 07, 2007 | Adobe Photoshop 7.0 (321115627)

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