Question

Find the ratio of the areas of two circle whose radii are 14cn and 21cm

Answer 1

area of first circle=pie r^2
                           =22/7*14*14
                           =44*14
                           =616cm^2
area of second circle=pie R^2
                                 =22/7*21*21
                                 =66*21
                                 =1386cm^2
now ratio of their areas=616/1386
                                     =308:693
hope it helps.^_^

Answer 2

here.................