Question 736471

if the circumferance of the circle is {{{42cm}}} 


what is the length of {{{AB}}} if it is {{{120}}} degrees?

since {{{120}}} degrees is {{{1/3}}} of full central angle in the circle, the length of the arc {{{AB}}} will be {{{1/3}}} of the circumferance of the circle is 

so, {{{AB=(1/3)42cm}}} 

{{{AB=14cm}}}