Joe places a mirror on the ground 60ft from the base of his school's clock tower. He walks backwards untill he can see the top of the tower in the mirror. At that point, his eyes are 6 ft above the ground, and he is 7.5 ft away from the mirror. How tall is the clock tower? How do I even begin to solve this????
The important thing to know here is that the angle of incidence must equal the angle of reflection.

So now this is our situation
Angle A and A' are both theta degres because they are altenate angles on parallel lines with th original thetas (angle of incident and angle of reflections.
This it is evident that these 2 triangles are similar,
so just like Dragonlance said.
\(\frac{h}{60}=\frac{6}{7.5}\\ h=\frac{6}{7.5}*60\\\)
6/7.5*60 = 48 feet