pi = 180' .How does this give a sense?
348082
It's the same as the pi you know and love (3.14......).  This is to do with units of measuring angles--specifically, radians and degrees.  Just as we can use different units for measuring length, such as inches and centimetres, there are a number of units for angles.  \n\nPi radians and 180 degrees are the same angle, equivalent to half of a complete rotation.  A radian is about 57 degrees.\n\nHow is a radian defined?  It is the angle such that, if you have a sector of a circle with angle 1 radian at the centre of the circle, then the length of the arc is equal to the radius.
699068
cos(60d)=1/2  and cos is negative in the 2nd and 3rd quadrant\nso in the 2nd quad. 180-60=120degrees and\nin the 3rd quad  180+60=240degrees\n\nIn radians cos(pi/3)=1/2\n120=180-60   is  pi-(pi/3)=2pi/3\n240=180+60  is pi+pi/3=4pi/3
1092540
Pi is the ratio of the circumference of a circle to its diameter. To put it another way, it's the length of the circumference divided by the length of the diameter.\n\nPi always works out to be the same value, no matter what size the circle is. So Pi is a Big Deal because it lets you easily measure the length of the curved line that makes up a circle.\n\nPi = C/D, so if you know the diameter and Pi, you can calculate the circumference.\n\nIF you do the math, and divide the circumference by the diameter, you'll get 3.14159265358979323846264338327950288419716939937510.....\n-- where the dots represent the fact that no matter how long you keep dividing, it never comes out even and the pattern of numbers doesn't repeat. It has reportedly been calculated out to 206 billion digits!!\n\nThere are charts that describe the history of Pi, which goes back to the Babylonians (2000 BC), and how accurately (or inaccurately) Pi has been calculated through the years. I'm sorry I can't make it appear in neat columns here, but you can see it neatly if you go to external link\n\nEven though the rough value of Pi was known long before his time, the first theoretical calculation seems to have been carried out by Archimedes of Syracuse (287-212 BC).
763047
Angle 2*pi is one revolution, so this arc is the circumference!\n2*pi*radius = 18*pi\n\nThere is also the general formula \narc length = radius * angle (in radians), which of course gives exactly the same result here.  But after 2 hours I guess you're not there to see this answer!  Sorry no-one responded earlier.
937438
180 degrees = π radian    ok!\n\nThe sum of the three angles of a triangle = 180 degree\nor, x + y + z = 180 deg.\nor, x + y = (180 - z)deg.\nor, x + y = 180(1 - z/180)deg.\nor, x + y = 180(1 - z/π) radian (pvd)
713706
the absolute difference is \n(360/11)-(180*((2-x%)/(11-y%)))\nwhen there is not gravity, the needle meet at 360/11 min from six.\nyou add or substract the difference(absolute value) when there is gravity.
155326
The value of pi is a constant which equals the circumference of a perfect circle divided by its diameter. It is a transcendental number, meaning that the number of decimals is infinite, yet all the numbers are defined. Pi holds a certain mystique to it, as it shows up in all kinds of math equations.\n\nYou may recognize its value as 3.1415926535897932384...\n\nPi was simply the Greek symbol chosen to represent this value.
680200
Assuming this means a circle...\n\ndefn/:\n\nc=circurmfernce\nA=area\nr=radius\nd=diameter\npi=pi (~3.1415926...)\nd=2*r\n\nC=2*pi*r=d*pi\nA=pi*(r^2)...(area is pi*r squared...pie are squared-no there not their round).\nA=pi*(d^2)/4.\n\njust plug and chug...\n\nC=10*pi.\nA=25*pi.\n\nanswer:\n\nit's that simple
1103302
Assume you have a number line, and through the origin (0) of that number line, you place another number line perpendicular to the first, so that the second origin is the same point as the first origin.  Now you have a [rectangular/Cartesian] coordinate plane.\nYou denote a point by measuring its distance along the horizontal axis from the origin, and then measuring its distance along the vertical axis from the origin and coming up with notation like (8,4).  It's 8 "to the right" and 4 "up" from the origin.\nWe use this plane to graph lines, circles, hyperbolas, parabolas, ellipses, etc.\n\nIf you don't want to get confused, stop reading here.\n\nThere is also a [circular/polar] coordinate plane, wherein you take a number line, and chop off half of it at the origin, so it's a ray.  The first coordinate is the distance from the origin along that ray.  The second coordinate is the measure of the angle you would make with the ray, and a second ray passing starting at the origin and including the point in question [typically measured in radians, so pi radians is 180°].  Like (4, 0) is 4 units "to the right" of the origin and (4,pi) is 4 units "to the left" of the origin.\nThis coordinate system is useful for graphing spirals and other looping curves.
545911
2pi rad=360deg\n==> x rad = (360*x)/2pi deg\n\nConversely,\n360 deg = 2pi rad\n==> x deg = (2pi*x)/360 rad
953348
pi= the circumference of a circle divided by the diameter\n\napprox 3.14159
1018456
r = d(pi)/180\nd = r(180)/pi\n\n\nr = -0.00923157  pi = 3.1415\n\nd = (-0.00923157)(180) / 3.1415\nd = -0.528929999
215277
6*6=36 36*pi=113.04 but if you leave it in pi form its 36pi
566422
cos150=\n\ncos(180-30)=\n\ncos(p-30)=\n\n-cos30=\n\n-sin60
83972
R*exp(i*theta) = R [ cos(theta) +i*sin(theta) ]\nthis is the polar representation (raduis R ,angle theta) transformed to the cartisienne form (X=R cos(theta), Y=R sin(theta))  where i is imaginary to matk that y is perpendic to x\n\nR=1 theta=pi/2\nexp(i*pi/2) = cos(pi/2) + i sin(pi/2)\nexp(i*pi/2) = 0 +i *1 =i\n\nso i=exp(i*pi/2)=e^(i*pi/2)    where e=2.7818281828\ni^i=e^(i*pi/2)^i\ni^i=e^(i^2*pi/2)\ni^i=exp(-pi/2)\n=0.207879576
59453
Using your unit circle, you can see that:\nsin 30 = sin 150 = -sin 210 = -sin 330 and\ncos 10 = cos 350 = -cos 170 = -cos 190\n\nThis illustrates some basic identities which you should memorize, namely that\n\nsin (180 - x) = sin x and sin (-x)= - sin x\nand\ncos (180 - x) = -cos x and cos (-x) = cos x\n\nThese are probably in the front or back cover of your textbook.  :)
1056486
They add up to 180 degrees.