Please give me the correct answer.Only answer if you're very good at math.Please don't put a link to a website.Please use the Pythagorean Theorem formula which is a^2 + b^2 =c^2.​
To find the answer square the 12 yds and subtract that from 30 yds squared. That will leave you with 27.49, and you would just round that decimal up to 27.5 for youir answer.
