- - Solve:
To find the volume of a sphere: 

3.14≈π
Now since its telling us to use π, then we do our formula by multiplying by π.
π=3.14 (Approximate amount) 
So:

So you are correct.
When Radius=9, you plug in for R. :) 
 
        
        
        
Step-by-step explanation:

( vertically opposite angles)



 
        
                    
             
        
        
        
Answer:
x=π/2 ,3π/2
Step-by-step explanation:
cot x(csc x+1)=0
either cot x=0
tanx=∞=tan (π/2)
x=π/2
or csc x=-1
or sin x=-1=-sin (π/2)=sin (π+π/2)=sin (3π/2)
x=3π/2