Using relations in a right triangle, considering c as the hypotenuse, we have that the length of side A is: 
<h3>What are the relations in a right triangle?</h3>
The relations in a right triangle are given as follows:
- The sine of an angle is given by the length of the opposite side to the angle divided by the length of the hypotenuse.
 
- The cosine of an angle is given by the length of the adjacent side to the angle divided by the length of the hypotenuse.
 
- The tangent of an angle is given by the length of the opposite side to the angle divided by the length of the adjacent side to the angle.
 
From the information given, we can build the following relation:
cos(A) = a/c.



More can be learned about relations in a right triangle at brainly.com/question/26396675
#SPJ1
 
        
             
        
        
        
Answer:
you simplify the fractions then you cross multiply 
Step-by-step explanation:
1/2 * 4/2 you multiply 1 and 4 and you get 4/4 which is equal to 1  
 
        
             
        
        
        
Answer:
PEMDAS
Step-by-step explanation:
parenthesis 
Exponents
Multiply
Divide
Add
Subtract 
 
        
             
        
        
        
Its can be divisible by 2