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Since 90 degrees is pi/2 radians, 70 degrees would be (7/9*pi/2)=7pi/18 radians.
Since 360 degrees equals 2 pi radians, to convert 7 degrees to radians simply divide by 360 and multiply by 2 times pi, giving 0.122 radians.
pi radians is 180 degrees.
The interior angles of a heptagon can have any value in the range (0, 2*pi) radians other than pi radians [(0, 360) degrees other than 180 degrees. The only restriction is that the sume of the interior angles must be (n-2)pi radians = (n-2)*180 degrees.
Multiply degrees by (pi/180) to get radians. Multiply radians by (180/pi) to get degrees.