Actually, the metric unit of angle is the radian. There are 2 x pi radians in a circle. Very commonly used in math, science and engineering, but not so common elsewhere. The milliradian (a thousandth of a radian) is a more practical unit of measure.
Interestingly, there is a military milliradian, or mil, that is 1/6400th of a circle. Close, but not quite the same as a true milliradian.
I have been dealing with mixed English and metric units since I went to engineering school in the late seventies. It's no big deal. I keep a book of conversion factors handy, and a conversion program on my Palm Pilot.
When I don't have a coversion table handy, I use the following rules:
A liter is a little bit bigger than a quart. A centimeter is a little bit smaller than half an inch. A kilometer is a little bit bigger than half a mile.
Temperature conversions are the worst. I just remember the following: -40F = -40C 32F = 0C 70F = 21C 212F = 100C From there I can interpolate close enough.
The US really missed the boat with metrification back in the seventies. One reason we don't export a lot of machinery is the pervasive use of English fasteners. And metrification has been very slow to take hold in the military and aerospace industries, where there are very few mil-spec metric fasteners.
That said, there are certain areas where we will never see metric units. The land in the US is all divided by sections and acres, we'll never see hectares. And certain metric units are very inconvenient to use, primarily due to fact that everything in SI (system international) is derived from meters, kilograms and seconds. So the Pascal, a unit of pressure, is too small to be useful (it's a Newton per square meter, which works out to about one ten-thousandth of a psi).
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