# Another Circle

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• Jun 4th 2007, 03:39 PM
Plato
A central angle is $0 \le \theta \le 2\pi$. Now because $2\pi \propto 6.283$ then 88.8 cannot be a radian measure. It must be in degrees, $88.8^ \circ \propto 1.55rad$.
So if the radius is 10 the an arc of $88.8^ \circ$ is about 15.5 units in length.

You must not confuse radians with degrees. All real mathematics uses radians; almost all calculators use radian measure as the default setting.
• Jun 4th 2007, 03:55 PM
stones44
haha i guess my class are not real mathematicians yet

thanks jhevon for the degrees conversion
• Jun 4th 2007, 03:58 PM
Jhevon
Quote:

Originally Posted by stones44
haha i guess my class are not real mathematicians yet

perhaps. i never started learning about radians in math until my last year in high school, which was kind of optional by the way. a lot of my peers never saw radians in high school math. do you use radians at all in your class? if so, you may need to know some conversion factors
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