Area of a circle = πr2 π = 3.14 what is the area of the car park, not including the arena itself?

To do this we just find the area of the rectangle
Then we subtract half the area of the circle form it
We are subtracting only half because that is the amount of the arena in the car park

where l = lenght
w = width
r = radius
radius = diameter/2 = 50/2 = 25

area of rectangle = lw
area of circle =

lw - 1/2( )
(75)(100) - 1/2(3.14)()
= 5537.5