The length of an arc subtended by a central angle is proportional to the circle's circumference. If the given central angle has measure  and the circle has radius
 and the circle has radius  , then the arc has length
, then the arc has length  such that
 such that

where  is given in radians. Then
 is given in radians. Then

If  is given in degrees, then
 is given in degrees, then

 
        
             
        
        
        
Answer: 
<em>0 < X < 40</em>
Explanation: 
[ Leg A ] 13
[ Leg B ] 27
[ Leg C ] x
Since We Are Missing The Third Side Of The Triangle. 
x Has To Be Greater Than 0 But Less Than 40 
 
        
             
        
        
        
The first one is 2/10.The second one is 2/4.The third one is 2/16,and the forth one is 3/6.