HELP ASAP!!!!!!!!!!!!!!!!!!!!!!Triangle A′B′C′ ​ is a dilation of ​ triangle ABC ​ . What is the scale factor? Enter your answer in the box. $\text{Basic}$ $x$y$x^2$\sqrt{ }$\frac{x}{ }$ $x\frac{ }{ }$ $x^{ }$x_{ }$\degree$\left(\right)$\abs{ }$\pi$\infty$ Note: Images may not be drawn to scale. Triangle ABC is shown. Side AB is labeled 9. Side BC is labeled 9. Side CA is labeled 18. Triangle A prime B prime C prime is shown. Side A prime B prime is labeled 4 and a half. Side B prime C prime is labeled 4 and a half. Side C prime A prime is labeled 9.