Krishna
0

Step 1: Find the known and unknown values in the question


Step 2: Recall the relationship between the circumference and radius.

            NOTE: Remember the relationship between circumference's

            and radius \frac{C}{C'} = \frac{R}{R'}.


Step 3: Substitute the known values in the relationship to know the unknown value.

                     \frac{C}{C'} = \frac{R}{R'}.    

           EXAMPLE:   40 = \frac{8}{R'}

                                R = \frac{1}{5}