Question

Can someone please help me? In △ABC, BD is an altitude.

Answer 1

Here is the problem

Answer 2

What is the length, in units, of BD?

First two choices are:
5
3
Last two choices are attached.

Answer 3

I am thinking it is one of the last two but not sure?

Answer 4

You can do this by triangles similarity

15 -> BD
BD -> 10

BD = (15*10)/BD

BD^2 = 150

BD = sqrt(150)

BD = 5*sqrt(6)

Answer 5

so this answre is correct?

Answer 6

thats what i've already said

Answer 7

Ok thank you for your help, I appreciate it.

Answer 8

welcome :)