Triangle DOG is an isosceles triangle. DO = OG mO = 126° What is mG? A. 27° B. 39° C. 54° D. 64°

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.