Imagine the path of the tip of the pendulum as an arc of a circle. The circle would have a radius of 4 feet and the arc would be 20 degrees. To calculate the length of the arc, you need to find 20 degrees of the circumference. 
Length of Arc = 2*pi*R*Degree of arc/360 
Length of Arc = 2*pi*4*20/360 
Length of Arc = 8pi * 1/18 
Length of Arc = 4/9 pi feet 
<span>Length of Arc ~ 1.396263402 feet 
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Answer:
so 2x+3x+130=180
so 5x+130=180
 5x=50
 so 2x =20 
 3x which is angle a is equal to 30 degree
 
        
                    
             
        
        
        
The value of the digit 5 in this number is 50 because 5 is in the tenth place.
        
                    
             
        
        
        
Answer:
x = 21
Step-by-step explanation:
Because GJ is a diameter, the angle K is a right angle (90 degrees).
Thus, 4x + 6 = 90, and 4x = 84.  Thus, x = 21