828 
It’s just simple multiplication
        
                    
             
        
        
        
Answer:
The arc length of the partial circle is 
Step-by-step explanation:
we know that
The circumference of a circle is equal to

In this problem we have a 3/4 of a circle 
so
the circumference is equal to


we have

substitute


 
        
             
        
        
        
Answer:

Step-by-step explanation:
Area of a circle with radius  :
: 
Circumference of a sector with radius  :
: 
Area of sector with angle  :
:   .
. 
Arc length of sector with angle  :
: 
Using these equations, we get the following information:
Area of circle: 
Circumference of a circle: 
Area of sector: 
Arc length of sector: 