Answer:
height = int(input ("Enter height : ") )
print (height)
width = int( input("Enter length : ") )
print (width)
half_width =width/2
half_height=height/2
while 0==0:
    radius = float( input("Enter radius : ") )
    print (radius)
    
    if radius<half_width and radius <half_height:
        break
def remainingVolume(height,width,radius):
        
    vol_box=height*width*width
    print (vol_box)
    vol_hole=3.14178*radius*radius*height
    print (vol_hole)
    
    remaining_vol=vol_box-vol_hole
    print ("Remaining volume is ",remaining_vol)
    
remainingVolume(height,width,radius);
Explanation:
Take input from user for height ,width and radius. To find volume of box formula is 
Let's assume width and length is same so 
length= width 
Using this formula of box volume find box volume.Now find volume of hole.
Consider hole as small cylinder, find volume of cylinder and subtract from volume of box to get remaining volume of box after hole.
