Please Help Urgent (Math)

Note  that the  area  of  the red region is  just the area  of the larger circle - area of the smaler circle  = 

(8.01^2 - 4.02^2) pi  

So.....the probability  that  a point fals into the red  area  =  

red area  /  area of large circle  =     

(8.01^2 - 4.02^2) pi                 8.01^2  - 4.02^2

________________  =          ______________   ≈   .748 =   74.8  % 

     8.01^2 pi                                 8.01^2