LENGTH OF AN ARC 1

Find radius if the length of an arc of the circle is ^∏/₃ cm.

Solution

L= ^∏/₃  , r = ?

L = ∏r

      180

^∏/3  = ∏r

         180

180  x ^∏/3  = ∏r  x   180   

                    180

180 ∏  = ∏r 

         3      

                    

180 ∏  = ∏r 

    3∏       ∏

180 ∏  =  r 

    3∏      

180   =  r 

    3      

r = 60cm

Hence radius is 60 cm

TRY THIS………………..

Find radius if the length of an arc of the circle is ^∏/₆ cm.