This is one of the special right triangles known as a 30, 60, 90 triangle. (Characterized by its angles) 
In these triangles, the shortest leg is HALF the length of the hypotenuse. 
The longest leg is (√3) times the length of the short leg. 
Therefore, the shortest leg is 20, and the longest leg is 20(√3)
FINAL ANSWER:
SHORT LEG: 20 units
LONG LEG: 20√3 units
        
             
        
        
        
I can’t read that so sorry I wish I could help you but I can’t bc I can’t read it 
        
             
        
        
        
Answer:
1 decilitre  
Step-by-step explanation:
You can look up charts for these. Look up litre chart
 
        
             
        
        
        
Answer:
y° = 7°
Step-by-step explanation:
  (8y +4) +(8y +4) +(8y +4)=180°   ( Equilateral Triangle)
24y +12= 180°
24y= 180-12
y=7°
 
        
             
        
        
        
Answer:
   (7√6)/2
Step-by-step explanation:
The side ratios in these special triangles are ...
   30°-60°-90° triangle: 1 : √3 : 2
   45°-45°-90° triangle: 1 : 1 : √2
This tells you the length of the horizontal line is 7√3, and the value of x is ...
   (7√3)/√2 = (7√6)/2
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<em>Additional comment</em>
Call the length of the horizontal line "y". Then the given ratios tell you ...
   7 : y = 1 : √3   ⇒   y/7 = √3/1   ⇒   y = 7√3
and
   x : y = 1 : √2   ⇒   x/y = 1/√2   ⇒   x = y/√2
When we rationalize the denominator, we get ...
   x = (y√2)/2 = ((7√3)√2)/2 = (7√6)/2