Is this the correct formula for arc length?
Arc length = 2ttr x central angle/360 degrees

Question

Is this the correct formula for arc length? 
Arc length = 2ttr x central angle/360 degrees

littlet · Answer

@Smartestbruh do you know if it is right?

phi · Answer

what is 2ttr ?

littlet · Answer

hold on let me check

littlet · Answer

I am not sure but it is what i found in my lesson 2TTr

phi · Answer

ok, that is
$$ s = 2 \pi r \frac{\theta}{360} $$
the TT is really pi  $ \pi$

littlet · Answer

Oh ok got it! thank you! idk why i thought it was TT lol

phi · Answer

people use a Greek letter pi for a "special" number
3.14159.... (it goes on forever)

littlet · Answer

what is the s= for? is it not arc length?

littlet · Answer

and oh ok.

phi · Answer

yes, s is "arc length"  In calculus, people use s (short for spatium, Latin for length).  Back in the time of Newton, when they invented this stuff, all the educated people used Latin

littlet · Answer

Oh alright so they are the same thing. ok that makes sense. Well Thank you so much!

phi · Answer

your equation is correct, as long as you measure the central angle in degrees.  If you use radians (another way to measure angles)
the arc length formula simplifies to
$$ s = r \ \theta$$
theta in radians

littlet · Answer

alright. Thank you.