No, pi is a ratio, often simplified as 22/7, used to calculate areas of circles, etc.
So, the area of a circle is pi times r2, where r = the radius of the circle.
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180
A radian is 180/pi degrees, or about 57 degrees
Pi is the ratio of a circle's circumference to its diameter, about 3.14159. Pi radians is equal to 180 degrees.
pi radians is 180 degrees.
On a circle, the "half-way" mark, is 180 degrees. That, in radians, is pi. The entire circle is 360 degrees or 2 pi.