What modern medium allows hoaxes to spread quickly and easily to a large number of people?

The internet can be  that medium

Explanation: Internet has connected all the markets making the world a global village. Good things and bad things can be traded on the net. Sadlly there have been many hoaxes on the net lately and it has not been so secure for sellers or purchasers.

the answer is

r ≈5.641

plug in the area of 100 yards into the equation

100=

divide each side by pi

≈ 31.8309=

take the square root of each side to find r

=r

r ≈5.641

i literally just read the book and studied it for months so i could you, but i need to know where these questions are coming from. they are too general.