The third option, 100* 
making it an abtuse triangle
If incorrect, sorry
 
        
             
        
        
        
Answer: Length of his shadow is 18 feet.
Step-by-step explanation:
Since we have given that 
Length of tall monument = 64 foot
Length of shadow = 16 feet
Length of pole where Kyle is standing = 6 feet 3 inch = 72 inches
So, we need to find the length of its shadow.
So, according to question, we get that 

Hence, length of his shadow is 18 feet.
 
        
             
        
        
        
Perimeter=2L+2W, in this case L=80+2(25) and W=170+2(25) so
P=2(L+W)=2(80+50+170+50)
P=2(350)=700m
        
             
        
        
        
Answer:40,600
Step-by-step explanation:
10x10x10x10=10,000
10x10=100
4x10,000+6x100
40,000+600=
40,600