The term pi refers to the ratio of a circle's diameter to its circumference. The actual value is a transcendental number, that is, a number whose decimal value "keeps going to infinity" and does not repeat. As such, pi has no "full form" unless we choose to just write the symbol, which means "exactly the number" which is the ratio of a circle's diameter to its circumference. That's as "full" as we can make it.
In other words, pi does have an exact value, but that value can not be expressed numerically.
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The area of the full circle is (pi R2) = (25 pi) square inches. The full circumference is (2 pi R) = (10 pi) inches. An arc length of 10 is [ 10/(10 pi) ] = ( 1 / pi ) of the full circle. So the area of the sector is (full area / pi) = (25 pi) / pi = 25 square inches
it never end pi is a radical; therefore, its symbol pi "π" is the whole answer, and there will never be an approximate answer.
The area of the full circle is (pi) R2 = (pi) (10)2 = 100 pi45° = 45°/360° = 1/8 of the full circle1/8 of the area of the full circle = 100 pi/8 = 12.5 pi square units.
Since 2 pi radians equals a full circle; the answer is pi / 2 pi being about 3.14159
22/7 * * * * * Since pi is a transcendental number, which is a kind of irrational number, there is no fractional form of pi. 22/7 is merely a fractional approximation.