triangulation

Phineas & Ferb

Roger Doofenshmirtz, we know
is six feet and two inches tall
And the beam that hit him
left a weird impression on that wall
So I took the angle from that point of where I knew he stood
And I found the building just like that because I understood

Triangulation!
That's how I figured it out
Triangulation!
Now I'm left with no doubt
The only geometric process using data I possess
That could pinpoint the conclusion of my scientific quest
Triangulaation!

Cha cha cha!