What is the poem "Counter-Attack" about?

"Attack" is a poem by British poet and World War I soldier Siegfried Sassoon, first published in his 1918 collection Counter-Attack and Other Poems. ... It describes the moment when soldiers, following the order to "attack," go over the trenches and into the line of enemy fire.

Explanation:

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