what is the easiest definition of RADIAN ?
967268
RADIAN - Rats And Dogs In Americans' Noses\nItis a measure of angle in a circle.\n180/pi
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In Euclidean plane geometry, π may be defined either as the ratio of a circle's circumference to its diameter, or as the ratio of a circle's area to the area of a square whose side is the radius. Advanced textbooks define π analytically using trigonometric functions, for example as the smallest positive x for which sin(x) = 0, or as twice the smallest positive x for which cos(x) = 0.\n\nAll these definitions are equivalent, they amount to the following numerical value of π, truncated to 50 decimal places:\n\n3.14159265358979323846264338327950288419716939937510... \n\nThe digits can be up to 4 millions digits (http://www.zenwerx.com/pi.php )
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You can use the Rydberg formula, which relates the reciprocal of the wavelength of the photon absorbed or emitted to the squares of the reciprocals of the principal quantum numbers.\n\n1/wavelength = R(1/n_l^2 - 1/n_u^2)\n\nSo, for the listed values of n, \n\nA.  1/w = R(1/ 2^2 - 1/4^2) = 0.1875R\nB.  1/w = -0.75R\nC.  1/w = 0.21R\nD.  1/w = -0.04861R\n\nSince energy and frequency are proportional to 1/wavelength,\nlooks like the order is D, A, C, B.
275054
1 radian= 57.2957795 degrees\nGo to refdesk.com and look at references for calculators
796855
if you mean an ellipse....\n\narea is equal to pi * minor radius * major radius
970313
r=radius\nd=diameter\n\n1 C=2r(pi)\n2 C=d(pi)\n\n(Same thing because 2r=d)
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Angles are formed by two rays that begin at the same point or the union of two rays with a common endpoint, called the vertex\n\nThey are measured in \ndegrees (360 = complete circle), \nminutes ' (60 minutes in one degree) and \nseconds " (60 seconds in one minute)
791247
You are correct about the conversion; however, the use of 'pi' is indicative of radians.
748896
The Fourier transform is a special case of the LaPlace transform.\n\nSpecifically s = jw, where w is the frequency in radians, j is square root of negative one (I'm an EE so we use j not i)
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Degrees or radians, the answer is the same.\n\nWhat is tan(90 degrees/2)? It's tan(45), or 1.\n\nWhat is tan(pi/2 radians/2)? It's tan (pi/4), or 1.
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it is the angle swept by the ray in unit time\nomega:angular velocity\n180 degrees=pi radians\ntheta = omega.time +1/2(angular acceleration).(time)^2
545911
2pi rad=360deg\n==> x rad = (360*x)/2pi deg\n\nConversely,\n360 deg = 2pi rad\n==> x deg = (2pi*x)/360 rad
135673
I'm not really sure of what your asking but if your talking about trigonometry (SOHCAHTOA)\nthen it's\n\nSin=opposite/hypotonuse\nCosine=ajacent/hypotonuse\nTangent=opposite/ajacent
4519
(4/3)*pi*r^3\n\n[four thirds pi r cubed]\n\ngood luck!
110639
The mathematical constant π is a real number which is defined as the ratio of a circle's circumference (Greek περιφέρεια, periphery) to its diameter in Euclidean geometry, and which is in common use in mathematics, physics, and engineering. The name of the Greek letter π is pi (pronounced pie in English), and this spelling can be used in typographical contexts where the Greek letter is not available. π is also known as Archimedes's constant (not to be confused with Archimedes's number) and Ludolph's number.
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pi*(r^2)\n\nIt doesn't matter which unit you use, just make sure you're consistent.
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multiply the degrees by pi and divide by 180\ndegree*pi/180=radians