What scale factor was applied to the first rectangle to get the resulting image? Enter your answer as a decimal in the box. pls help

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.

It will might be false

Equatorial triangle and obtuce angle