Constant to convert angles in fixed point format to radians.


extern const fixed fixtorad_r;
This constant gives a ratio which can be used to convert a fixed point number in binary angle format to a fixed point number in radians. Example:
      fixed rad_angle, binary_angle;
      /* Set the binary angle to 90 degrees. */
      binary_angle = 64;
      /* Now convert to radians (about 1.57). */
      rad_angle = fixmul(binary_angle, fixtorad_r);
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