# Question #ed863

##### 1 Answer

OK, we can, but it’s not very easy.

#### Explanation:

Firstly, there is the definition of an arc-second. A degree is

Next there is a very simple link between arc length, s (which we will assume to be equal to the diameter of the nickel), the radius, r (the distance we need to find) and the angle in radians,

Finally, the diameter of the nickel is 21.21mm (had to google that, I’m British) which we convert to

You could criticise this result as the diameter of the nickel is actually a chord, not an arc, but I suspect it makes little difference to your answer.