Question 391653
A stick 2 m long is placed vertically at point B.
 The top of the stick is line with the top of a tree as seen from point A,
 which is 3 m from the stick and 30 m from the tree.
: How tall is the tree?
:
let t = height of the tree
:
Using the properties of similar right triangles:
{{{2/t}}} = {{{3/30}}}
Cross multiply
3t = 2(30)
3t = 60
t = 20 m is the tree