Answer:
x = 84 
Step-by-step explanation:
Sum of angles around a point = 360
Sum of given angles = 132+54+90 = 132+144 = 276
So, x must cover the angle remaining from 276 to form 360, which is 
360-276 = 84degrees.
Hope this helps 
 
        
                    
             
        
        
        
Hello !
You have to do as follow :

 
        
                    
             
        
        
        
The diagonals intersect perpendicularly, two consecutive angled are supplementary, and that opposite angles are equal
        
             
        
        
        
^ means to the power of or exponent 
logb(x) = y is b^y = x