El area de un parque que riene forma circular es de 121πm² . determine la longitud del cerco que se debe colocar alrededor de diho parque , si hay que darle 3 vueltas ( considerar π=3,14)

The answer is

First step is to get rid of the square root. remember that a square root is the same as raising to the (1/2) power. see below: multiply exponents per exponent rules to get: remember you subtract exponents from the denominator and add exponents in the numerator so: simplify further: so a is the correct choice. if you don't understand this google exponent rules and it will you understand. look at the image results.

The principal, real, root of: 50−−√2=7.071067817.07106781−7.0710678150 is not a perfect square

Well it depends, i think b bc yeah