to prevent confusion i want to tell something about radius

from sharma sir,

 

r=mod[5/10]

 

  =mod[ (5 5)  /  (25)

 

  =mod[5/2]

 

hence ,r²=5/2

 

P.S:i was stranded here for some time as   was missing in 2.so i thought of clearing it

thank you sirs

bye,