So the similarity ratio of triangle ADE and triangle ABC is two-thirds root sign.
That is, AD:AB= (root number 2)/2.
14. solution: m 2/n 2 (the ratio of surface area is the square of similarity ratio and the volume is the cube of similarity ratio).
16. solution: for x seconds, BD=2x, AD=8-2x.
DE| | BC So triangle ADE is similar to triangle ABC.
AD:AB = DE:BC = & gt; (8-2x):8=y:9
y = 9/8(8-2x)(0 & lt; = x & lt=4)
I hope it will be helpful to your study, and I wish you progress in your study! Hope to adopt!