Answer:
18
Step-by-step explanation:
18 over 1 is still 18. It shouldn't be a mixed number
 
        
                    
             
        
        
        
The angle from which helicopter take off approximately equals 11.30993247;
        
             
        
        
        
<h3>
Answer:  22</h3>
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Explanation:
- x = measure of angle 1 = angle WXY
- 2x = twice the measure of angle 1 = measure of angle 2 = angle YXZ
The two angles mentioned combine to form angle WXZ which is 66 degrees.
angle1+angle2 = angle WXZ
x+2x = 66
3x = 66
x = 66/3
x = 22
Angle 1 is 22 degrees and angle 2 is 22*2 = 44 degrees.
Check: 
angle1+angle2 = 22+44 = 66 = angle WXZ
 
        
        
        
The answer would be 18 square units
Step-by-step explanation:
When talking about surface area, just add up all the units that is listed in the question. - just a tip ;)
Anyways, Hope this helps!! If it's wrong, feel free to curse me out.. haha...