Question

A ladder leaning against a wall makes a 60o angle with the ground. The base of the ladder is 4 m from
the building. How high above the ground is the top of the ladder?

Answer 1

they r asking u to find AB

Answer 2

tan (60) = AB /BC
AB = BC tan(60)
= 4tan(60)

Answer 3

exactly

Answer 4

so its 6.9?

Answer 5

u can find the height now..
tan(60) = sqrt 3

Answer 6

Yes, it's 6.9.
Another way to do it instead of using trig, is realizing its a special 30-60-90 triangle

http://www.mathwarehouse.com/geometry/triangles/right-triangles/special-right-triangles.php

Answer 7

yeah!

Answer 8

thanks @Nikato and thanks isuru :)

Answer 9

u r welcome