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2006-11-19 09:13:12 · 12 answers · asked by allison 1 in Science & Mathematics Mathematics

12 answers

The Greek letter pi is a constant approximately equal to 3.1415. It is irrational, meaning that it has been proven that it's digits continue forever without repeating, and that it cannot be written as a fraction.

The definition of pi is the ratio of a circle's diameter to it's circumference, but it has the curious property of popping up all over the place in other forms of math too.

2006-11-19 09:20:39 · answer #1 · answered by Texas Cowgirl 3 · 0 0

(pi^2)/6=1+1/4+1/9+1/16+1/25+1/36

6/(pi^2)=the probability that 2 random integers have no common factors.

pi is the ratio c/d where c is the circumference and d is the diameter of the circle.

2006-11-19 09:19:10 · answer #2 · answered by Anonymous · 1 0

pi is an irrational number, which is approximately equal to 3.1415926535. pi appears in the formula A=pi*r*r, where A is the area of a circle and r is its radius. it also occurs in the formula C=pi*d, where C is the circumference of a circle and d is its diameter. one method of approximating pi is pi/4=1- (1/3)+ (1/5)- (1/7)+ (1/9) +... the volume of a sphere is (4/3)*pi*r^3, and the surface area of a sphere is 4*pi*r^2.
pi is also used to measure angles. the radian system uses 2*pi radians instead of 360 degrees to measure angles.

2006-11-19 09:19:24 · answer #3 · answered by Ramesh S 2 · 0 0

I fear that I will always be A lonely number like root three The three is all that’s good and right, Why must my three keep out of sight Beneath the vicious square root sign, I wish instead I were a nine For nine could thwart this evil trick, with just some quick arithmetic I know I’ll never see the sun, as 1.7321 Such is my reality, a sad irrationality When hark! What is this I see, Another square root of a three Has quietly come waltzing by, Together now we multiply To form a number we prefer, Rejoicing as an integer We break free from our mortal bonds With the wave of magic wands Our square root signs become unglued Your love for me has been renewed

2016-05-22 04:23:27 · answer #4 · answered by ? 4 · 0 0

Well "pi" is actually the way most people now seem to write the greek leter π due to dumbing down of schools.

in mathematics (which is the real name for math) it is used to represenct the special irrational number that starts 3.142

It is the ratio of the raduis and circumference of a circle.

2006-11-19 09:16:23 · answer #5 · answered by rchlbsxy2 5 · 0 1

"pi" is a greek term used to find the area and circumferences of circles
pi is rounded to 3.14
area of circle = pi(r^2)
r = radius
circumference of circle = (2r)pi
pi is also used to describe radians used in the unit circle
180 degrees is equivalent to pi

2006-11-19 09:15:59 · answer #6 · answered by trackstarr59 3 · 0 0

its used usually to do with circles
area of a circle = pi * r squared

2006-11-19 09:15:42 · answer #7 · answered by pinkfudge27 4 · 0 0

The mathematical constant pi (π) is an irrational real number, approximately equal to 3.14159, which is the ratio of a circle's circumference to its diameter in Euclidean geometry, and has many uses in mathematics, physics, and engineering.

The constant pi (π) appears in many formulae in geometry involving circles and spheres. In the following formulae, "r" = radius and "d" = diameter...

Circumfrence of a circle --- C = (2)(π)(r) = (π)(d)
Area of a circle --- A = (π)(r²) = (¼)(π)(d²)
Area of ellipse (with semiaxes "a" and "b") --- A = (π)(a)(b)
Volume of sphere --- V = (4/3)(π)(r³) = (1/6)(π)(d³)
Surface area of sphere --- A = (4)(π)(r²) = (π)(d²)
Volume of cylinder (of height "h") --- V = (1/3)(π)(r²)(h)
Surface area of cylinder (of height "h") --- A = (2)(π)(r²) + (2)(π)(r)(h) = (2)(π)(r)(r + h)
Volume of cone (of height "h") --- V = (1/3)(π)(r²)(h)
Surface area of cone (of height "h") --- A = (π)(r)(√r² + h²) + (π)(r²) = (π)(r)[r + (√r² + h²)]

In conclusion, pi is used for numerous calculations.

2006-11-19 09:50:57 · answer #8 · answered by Anonymous · 0 0

lets go with π resembles the ammount of radians that it takes to go half way arround the circle, in linear geometry dealing with circles and sphears it plays an intricate role for calculating area circumfrance/surface area, it is also vital in trig using sine cosine and tangent and defineing all three

2006-11-19 09:20:05 · answer #9 · answered by R 2 the T 2 · 0 0

Pi is used when calculating formulas that relate to circles generally. Pi stands for 3.1415927......

2006-11-19 09:16:57 · answer #10 · answered by Krisie 2 · 0 1

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