Aholding pen for cattle must be square and have a diagonal length of 84 84 meters. a. find the length of a side of the pen. b. find the area of the pen.

We know that
Applying the Pythagoras Theorem
c²=a²+b²
in a square
a=b
c is the diagonal> 84 m
c²=2a²> a²=c²/2> a²=84²/2> a²=3528> a=√3528 m

the answer part a) is
√3528 m or 59.40 m

the area of the pen is a²> 3528 m²

the answer Part b) is 
3528 m²

Claude debussy's music was associated with answer choice 3, impressionist