LENGTH OF AN ARC 2

Find radius if the length of an arc of the circle is ^∏/₄ cm.

Solution

L= ^∏/₄  , r = ?

L = ∏r

      180

^∏/4  = ∏r

         180

180  x ^∏/4  = ∏r  x   180   

                    180

180 ∏  = ∏r 

         4      

                    

180 ∏  = ∏r 

  4∏      ∏

180   =  r 

    4      

r = 45cm

Hence radius is 45 cm

TRY THIS………………..

Find radius if the length of an arc of the circle is ^∏/₅ cm.