Answer:
Wait what 
Step-by-step explanation: is this a question or??
 
        
             
        
        
        
Answer:
 k just doing this for points  
Step-by-step explanation:
 
        
             
        
        
        
Answer:
Step-by-step explanation:

 
        
             
        
        
        
Answer:
B
Step-by-step explanation:
Using the cosine ratio in the right triangle and the exact value
cos45° =  , then
 , then
cos45° =  =
 =  =
 =  ( cross- multiply )
 ( cross- multiply )
c = 3