ARC LENGTH-1

Find radius if the length of an arc of the circle is ^∏/₃₆ cm.

Solution

L= ^∏/₃₆  , r = ?

L = ∏r

      180

^∏/12  = ∏r

           180

180  x ^∏/12  = ∏r  x   180   

                      180

 180 ∏  = ∏r 

     36      

                    

 180 ∏  = ∏r 

    36∏  ∏

5   =  r 

1      

     

r = 5cm

Hence radius is 5cm

TRY THIS………………..

Find radius if the length of an arc of the circle is ^∏/₂₀ cm.