180 degrees in a radian
It's a Ditloid. 180 Maximum Score in Darts.
The solution to the ditloid "50 d in a y" is "50 days in a year." A ditloid is a type of word puzzle where numbers and letters represent a phrase or saying. In this case, it refers to the number of days typically found in a year.
1 Hump on a Dromedary
60 Minutes in a Degree
Top score with three darts
28 Days in Four Weeks
1st March = Saint Davids Day Gavin.
December 21 the winter solstice
32 Degrees Fahrenheit at which Water Freezes
A Social Security Number has 9 Digits
52 cards in a deck without the jokers
9 C of H in D I? 9 circles of hell in Dante's inferno.