LENGTH OF AN ARC 1

Find radius if the length of an arc of the circle is ^∏/₁₅ cm.

Solution

L= ^∏/₁₅  , r = ?

L = ∏r

      180

^∏/15  = ∏r

         180

180  x ^∏/15  = ∏r  x   180   

                    180

180 ∏  = ∏r 

    15      

                    

180 ∏  = ∏r 

    15∏  ∏

180   =  r 

    15      

r = 12cm

Hence radius is 12 cm

TRY THIS………………..

Find radius if the length of an arc of the circle is ^∏/₃₀ cm.