ARC LENGTH 1

Find radius if the length of an arc of the circle is ^∏/₄₅ cm.

Solution

L= ^∏/₄₅  , r = ?

L = ∏r

     180

^∏/45  = ∏r

            180

180  x ^∏/45  = ∏r  x   180  1  

                      180 1

 180 ∏  = ∏r 

     45      

                    

 180 ∏  = ∏r 

    45∏  ∏

4   =  r 

1      

     

r = 4cm

Hence radius is 4cm

TRY THIS………………..

Find radius if the length of an arc of the circle is ^∏/₅₀ cm.

Answer: 3.6