+0  
 
0
454
1
avatar

simple geometry

 

 Apr 14, 2020
 #1
avatar+23245 
+1

The two triangles are similar by AA -- both have a right angle and the angle of incidence equals the angle

of reflection.

 

Therefore,      (the height of the triangle) / 20'  =  6'/3'

 Apr 14, 2020

5 Online Users

avatar
avatar
avatar
avatar