How do I solve this question?

[rylieheady17]

 

[AmandasMathHelp]

Try stuff! Use the Pythagorean theorem! Then show us your work and if you still don't understand we'll help you out.

 

[R.M.]

Notice any similar triangles? What proportional relationships exist?

 

[pka]

View attachment 25484

The line segment \(\overline{DB}\) is an altitude to the hypotenuse & is a mean-proportional between the parts.
Its length is \(\| BD\|=\sqrt{30}\)