Pinguecula, yellowish growths on the surface of the sclera, the white part of the eye, often occur in people who spent a lot of time in the sun. Although most pinguecula occur in middle aged or older people, children can also develop them, All About Vision states.
1 radian = 180 / pi degrees. This cannot be written in the format pi/x. cyberkiwi's answer would be in units of revolution, such that 1 rev is equivalent to a complete circle. Then 1/(2pi) revs would be equivalent to 1 radian.
If your argument is in degrees, multiply it by PI()/180 or use the RADIANS function to convert it to radians. Example. Copy the example data in the following table, and paste it in cell A1 of a new Excel worksheet. For formulas to show results, select them, press F2, and then press Enter.