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.
Definition of radian: a radian is the measure of an angle that, when drawn a central angle of a circle, intercepts an arc whose length is equal to the length of the radius of the circle. The video below is an animation of 1 radian. Notice how the length of 1 radius stretches out to a portion of the circle. That portion is 1 radian of the circle. There is a simple formula to convert radians to degrees. 1Ï radian = 180. Therefore you can easily convert from one unit of measure to the other.