what is the difference of the phi sign used for 180 degrees & for 22/7 . is it the same? please explain?
2007-01-01 21:32:24 · 5 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
Its the difference between degrees and radians
180 degrees = pi radians
One radian = when the radius = length of arc decribed ~ 57.3 degrees
2007-01-01 21:36:42 · answer #1 · answered by Anonymous · 0⤊ 0⤋
It is the same but you might care to know that the letter is not phi, but pi.
Also pi = 22/7 is not an equality but an approximation, the number pi cannot be represented as a finite fraction.
180 degrees = pi radians , consider a circle with two radii subtending an angle at the centre such that the sector formed has curved length the same as the radius.
2007-01-02 00:40:53 · answer #2 · answered by yasiru89 6 · 0⤊ 0⤋
Your question is about "pi".
180 degrees is equal to π radians, so π is the conversion factor between these two common units in which angles are measured.
22/7 is a common approximation to the mathematical constant π, the ratio of the circumference of a circle to its diameter. This is exactly the same π as the angular measurement conversion factor above.
There is also a mathematical constant "phi" which is another letter of the greek alphabet, and is not the same as "pi".
2007-01-01 22:17:22 · answer #3 · answered by Anonymous · 0⤊ 0⤋
The pi sign, π, is a precise number starting 3.141592653589793238462643 ... and going on for ever! 22/7 gives 3.142857...and you can see it is only accurate to 3 significant figures.
2007-01-01 21:42:03 · answer #4 · answered by JJ 7 · 0⤊ 0⤋
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2016-05-23 05:40:20 · answer #5 · answered by Anonymous · 0⤊ 0⤋