As title. If you have a circle of known diameter, what is equation to calculate the length of the arc for, eg, a 12deg angle?

i should know this but cant remember and Zeus book is in garage.

pie x diameter gives you circumference. surely divide this by 360 degrees and multiply by angle of arc in degrees to give the arc length?!

Ned.

divide 12 by 360 gives you the proportion of the circle for the 12 deg. arc

multiply by circumference (diam.x pi)

did it in work today. boss was rooting through his text books for equations and 4 figure tables and i worked it out in about 10 seconds, didn't have the heart to tell him



[Edited on 20/1/06 by liam.mccaffrey]
same as ned

[Edited on 20/1/06 by liam.mccaffrey]

According to the book of Genesis, the Arc shall be 300 cubits long.

I can't say for definite but I Noah bloke who can.

is he the bloke that bought that old boat !