Answer:
≈130.14 yards
Step-by-step explanation:

Cross Multiply

 
        
             
        
        
        
If the diameter is 1/2 mile, that is 0.5 mile, then the radius is 0.25 -half of it!
the angular speed is theta/time, which means
 w=theta/time
but another formula for it is Velocity*radians
w=velocity*radians
velocity is 180 mph and radians are (revolution/2

 radius), that is:
w=180*(1/2

*0.25)
and if we calculate this, we have: w=114.59, which is the correct answer!
 
        
        
        
The intersection of the gaphs of the two equations are at point (-2, 0) and (3, 5) which are the solutions to the system of equations.
 
        
        
        
Height of the pentagon = 9 ft
Edge of base = 3 ft 

s is the length of any side = 3
n is the number of sides = 5 
tan is the tangent function calculated in degrees 

Volume of the pentagon = area of base (height )
Volume of the pentagon = 15.4852 (9)
Volume of the pentagon = 139.366
Volume of the pentagon = 139.37 cu.ft